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) 2018-2024 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 #include <net/gso.h> 30 31 #include "ieee80211_i.h" 32 #include "driver-ops.h" 33 #include "led.h" 34 #include "mesh.h" 35 #include "wep.h" 36 #include "wpa.h" 37 #include "wme.h" 38 #include "rate.h" 39 40 /* misc utils */ 41 ieee80211_duration(struct ieee80211_tx_data * tx,struct sk_buff * skb,int group_addr,int next_frag_len)42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 43 struct sk_buff *skb, int group_addr, 44 int next_frag_len) 45 { 46 int rate, mrate, erp, dur, i, shift = 0; 47 struct ieee80211_rate *txrate; 48 struct ieee80211_local *local = tx->local; 49 struct ieee80211_supported_band *sband; 50 struct ieee80211_hdr *hdr; 51 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 52 struct ieee80211_chanctx_conf *chanctx_conf; 53 u32 rate_flags = 0; 54 55 /* assume HW handles this */ 56 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 57 return 0; 58 59 rcu_read_lock(); 60 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf); 61 if (chanctx_conf) { 62 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 63 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 64 } 65 rcu_read_unlock(); 66 67 /* uh huh? */ 68 if (WARN_ON_ONCE(tx->rate.idx < 0)) 69 return 0; 70 71 sband = local->hw.wiphy->bands[info->band]; 72 txrate = &sband->bitrates[tx->rate.idx]; 73 74 erp = txrate->flags & IEEE80211_RATE_ERP_G; 75 76 /* device is expected to do this */ 77 if (sband->band == NL80211_BAND_S1GHZ) 78 return 0; 79 80 /* 81 * data and mgmt (except PS Poll): 82 * - during CFP: 32768 83 * - during contention period: 84 * if addr1 is group address: 0 85 * if more fragments = 0 and addr1 is individual address: time to 86 * transmit one ACK plus SIFS 87 * if more fragments = 1 and addr1 is individual address: time to 88 * transmit next fragment plus 2 x ACK plus 3 x SIFS 89 * 90 * IEEE 802.11, 9.6: 91 * - control response frame (CTS or ACK) shall be transmitted using the 92 * same rate as the immediately previous frame in the frame exchange 93 * sequence, if this rate belongs to the PHY mandatory rates, or else 94 * at the highest possible rate belonging to the PHY rates in the 95 * BSSBasicRateSet 96 */ 97 hdr = (struct ieee80211_hdr *)skb->data; 98 if (ieee80211_is_ctl(hdr->frame_control)) { 99 /* TODO: These control frames are not currently sent by 100 * mac80211, but should they be implemented, this function 101 * needs to be updated to support duration field calculation. 102 * 103 * RTS: time needed to transmit pending data/mgmt frame plus 104 * one CTS frame plus one ACK frame plus 3 x SIFS 105 * CTS: duration of immediately previous RTS minus time 106 * required to transmit CTS and its SIFS 107 * ACK: 0 if immediately previous directed data/mgmt had 108 * more=0, with more=1 duration in ACK frame is duration 109 * from previous frame minus time needed to transmit ACK 110 * and its SIFS 111 * PS Poll: BIT(15) | BIT(14) | aid 112 */ 113 return 0; 114 } 115 116 /* data/mgmt */ 117 if (0 /* FIX: data/mgmt during CFP */) 118 return cpu_to_le16(32768); 119 120 if (group_addr) /* Group address as the destination - no ACK */ 121 return 0; 122 123 /* Individual destination address: 124 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 125 * CTS and ACK frames shall be transmitted using the highest rate in 126 * basic rate set that is less than or equal to the rate of the 127 * immediately previous frame and that is using the same modulation 128 * (CCK or OFDM). If no basic rate set matches with these requirements, 129 * the highest mandatory rate of the PHY that is less than or equal to 130 * the rate of the previous frame is used. 131 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 132 */ 133 rate = -1; 134 /* use lowest available if everything fails */ 135 mrate = sband->bitrates[0].bitrate; 136 for (i = 0; i < sband->n_bitrates; i++) { 137 struct ieee80211_rate *r = &sband->bitrates[i]; 138 139 if (r->bitrate > txrate->bitrate) 140 break; 141 142 if ((rate_flags & r->flags) != rate_flags) 143 continue; 144 145 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 146 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 147 148 switch (sband->band) { 149 case NL80211_BAND_2GHZ: 150 case NL80211_BAND_LC: { 151 u32 flag; 152 if (tx->sdata->deflink.operating_11g_mode) 153 flag = IEEE80211_RATE_MANDATORY_G; 154 else 155 flag = IEEE80211_RATE_MANDATORY_B; 156 if (r->flags & flag) 157 mrate = r->bitrate; 158 break; 159 } 160 case NL80211_BAND_5GHZ: 161 case NL80211_BAND_6GHZ: 162 if (r->flags & IEEE80211_RATE_MANDATORY_A) 163 mrate = r->bitrate; 164 break; 165 case NL80211_BAND_S1GHZ: 166 case NL80211_BAND_60GHZ: 167 /* TODO, for now fall through */ 168 case NUM_NL80211_BANDS: 169 WARN_ON(1); 170 break; 171 } 172 } 173 if (rate == -1) { 174 /* No matching basic rate found; use highest suitable mandatory 175 * PHY rate */ 176 rate = DIV_ROUND_UP(mrate, 1 << shift); 177 } 178 179 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 180 if (ieee80211_is_data_qos(hdr->frame_control) && 181 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 182 dur = 0; 183 else 184 /* Time needed to transmit ACK 185 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 186 * to closest integer */ 187 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 188 tx->sdata->vif.bss_conf.use_short_preamble, 189 shift); 190 191 if (next_frag_len) { 192 /* Frame is fragmented: duration increases with time needed to 193 * transmit next fragment plus ACK and 2 x SIFS. */ 194 dur *= 2; /* ACK + SIFS */ 195 /* next fragment */ 196 dur += ieee80211_frame_duration(sband->band, next_frag_len, 197 txrate->bitrate, erp, 198 tx->sdata->vif.bss_conf.use_short_preamble, 199 shift); 200 } 201 202 return cpu_to_le16(dur); 203 } 204 205 /* tx handlers */ 206 static ieee80211_tx_result debug_noinline ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data * tx)207 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 208 { 209 struct ieee80211_local *local = tx->local; 210 struct ieee80211_if_managed *ifmgd; 211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 212 213 /* driver doesn't support power save */ 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 215 return TX_CONTINUE; 216 217 /* hardware does dynamic power save */ 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 219 return TX_CONTINUE; 220 221 /* dynamic power save disabled */ 222 if (local->hw.conf.dynamic_ps_timeout <= 0) 223 return TX_CONTINUE; 224 225 /* we are scanning, don't enable power save */ 226 if (local->scanning) 227 return TX_CONTINUE; 228 229 if (!local->ps_sdata) 230 return TX_CONTINUE; 231 232 /* No point if we're going to suspend */ 233 if (local->quiescing) 234 return TX_CONTINUE; 235 236 /* dynamic ps is supported only in managed mode */ 237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 238 return TX_CONTINUE; 239 240 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 241 return TX_CONTINUE; 242 243 ifmgd = &tx->sdata->u.mgd; 244 245 /* 246 * Don't wakeup from power save if u-apsd is enabled, voip ac has 247 * u-apsd enabled and the frame is in voip class. This effectively 248 * means that even if all access categories have u-apsd enabled, in 249 * practise u-apsd is only used with the voip ac. This is a 250 * workaround for the case when received voip class packets do not 251 * have correct qos tag for some reason, due the network or the 252 * peer application. 253 * 254 * Note: ifmgd->uapsd_queues access is racy here. If the value is 255 * changed via debugfs, user needs to reassociate manually to have 256 * everything in sync. 257 */ 258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 261 return TX_CONTINUE; 262 263 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 264 ieee80211_stop_queues_by_reason(&local->hw, 265 IEEE80211_MAX_QUEUE_MAP, 266 IEEE80211_QUEUE_STOP_REASON_PS, 267 false); 268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 269 ieee80211_queue_work(&local->hw, 270 &local->dynamic_ps_disable_work); 271 } 272 273 /* Don't restart the timer if we're not disassociated */ 274 if (!ifmgd->associated) 275 return TX_CONTINUE; 276 277 mod_timer(&local->dynamic_ps_timer, jiffies + 278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 279 280 return TX_CONTINUE; 281 } 282 283 static ieee80211_tx_result debug_noinline ieee80211_tx_h_check_assoc(struct ieee80211_tx_data * tx)284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 285 { 286 287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 289 bool assoc = false; 290 291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 292 return TX_CONTINUE; 293 294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 296 !ieee80211_is_probe_req(hdr->frame_control) && 297 !ieee80211_is_any_nullfunc(hdr->frame_control)) 298 /* 299 * When software scanning only nullfunc frames (to notify 300 * the sleep state to the AP) and probe requests (for the 301 * active scan) are allowed, all other frames should not be 302 * sent and we should not get here, but if we do 303 * nonetheless, drop them to avoid sending them 304 * off-channel. See the link below and 305 * ieee80211_start_scan() for more. 306 * 307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 308 */ 309 return TX_DROP; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 312 return TX_CONTINUE; 313 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 315 return TX_CONTINUE; 316 317 if (tx->sta) 318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 319 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 321 if (unlikely(!assoc && 322 ieee80211_is_data(hdr->frame_control))) { 323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 324 sdata_info(tx->sdata, 325 "dropped data frame to not associated station %pM\n", 326 hdr->addr1); 327 #endif 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 329 return TX_DROP; 330 } 331 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 332 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 333 /* 334 * No associated STAs - no need to send multicast 335 * frames. 336 */ 337 return TX_DROP; 338 } 339 340 return TX_CONTINUE; 341 } 342 343 /* This function is called whenever the AP is about to exceed the maximum limit 344 * of buffered frames for power saving STAs. This situation should not really 345 * happen often during normal operation, so dropping the oldest buffered packet 346 * from each queue should be OK to make some room for new frames. */ purge_old_ps_buffers(struct ieee80211_local * local)347 static void purge_old_ps_buffers(struct ieee80211_local *local) 348 { 349 int total = 0, purged = 0; 350 struct sk_buff *skb; 351 struct ieee80211_sub_if_data *sdata; 352 struct sta_info *sta; 353 354 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 355 struct ps_data *ps; 356 357 if (sdata->vif.type == NL80211_IFTYPE_AP) 358 ps = &sdata->u.ap.ps; 359 else if (ieee80211_vif_is_mesh(&sdata->vif)) 360 ps = &sdata->u.mesh.ps; 361 else 362 continue; 363 364 skb = skb_dequeue(&ps->bc_buf); 365 if (skb) { 366 purged++; 367 ieee80211_free_txskb(&local->hw, skb); 368 } 369 total += skb_queue_len(&ps->bc_buf); 370 } 371 372 /* 373 * Drop one frame from each station from the lowest-priority 374 * AC that has frames at all. 375 */ 376 list_for_each_entry_rcu(sta, &local->sta_list, list) { 377 int ac; 378 379 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 380 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 381 total += skb_queue_len(&sta->ps_tx_buf[ac]); 382 if (skb) { 383 purged++; 384 ieee80211_free_txskb(&local->hw, skb); 385 break; 386 } 387 } 388 } 389 390 local->total_ps_buffered = total; 391 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 392 } 393 394 static ieee80211_tx_result ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data * tx)395 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 396 { 397 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 399 struct ps_data *ps; 400 401 /* 402 * broadcast/multicast frame 403 * 404 * If any of the associated/peer stations is in power save mode, 405 * the frame is buffered to be sent after DTIM beacon frame. 406 * This is done either by the hardware or us. 407 */ 408 409 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 410 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 411 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 412 if (!tx->sdata->bss) 413 return TX_CONTINUE; 414 415 ps = &tx->sdata->bss->ps; 416 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 417 ps = &tx->sdata->u.mesh.ps; 418 } else { 419 return TX_CONTINUE; 420 } 421 422 423 /* no buffering for ordered frames */ 424 if (ieee80211_has_order(hdr->frame_control)) 425 return TX_CONTINUE; 426 427 if (ieee80211_is_probe_req(hdr->frame_control)) 428 return TX_CONTINUE; 429 430 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 431 info->hw_queue = tx->sdata->vif.cab_queue; 432 433 /* no stations in PS mode and no buffered packets */ 434 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 435 return TX_CONTINUE; 436 437 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 438 439 /* device releases frame after DTIM beacon */ 440 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 441 return TX_CONTINUE; 442 443 /* buffered in mac80211 */ 444 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 445 purge_old_ps_buffers(tx->local); 446 447 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 448 ps_dbg(tx->sdata, 449 "BC TX buffer full - dropping the oldest frame\n"); 450 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 451 } else 452 tx->local->total_ps_buffered++; 453 454 skb_queue_tail(&ps->bc_buf, tx->skb); 455 456 return TX_QUEUED; 457 } 458 ieee80211_use_mfp(__le16 fc,struct sta_info * sta,struct sk_buff * skb)459 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 460 struct sk_buff *skb) 461 { 462 if (!ieee80211_is_mgmt(fc)) 463 return 0; 464 465 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 466 return 0; 467 468 if (!ieee80211_is_robust_mgmt_frame(skb)) 469 return 0; 470 471 return 1; 472 } 473 474 static ieee80211_tx_result ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data * tx)475 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 476 { 477 struct sta_info *sta = tx->sta; 478 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 480 struct ieee80211_local *local = tx->local; 481 482 if (unlikely(!sta)) 483 return TX_CONTINUE; 484 485 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 486 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 487 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 488 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 489 int ac = skb_get_queue_mapping(tx->skb); 490 491 if (ieee80211_is_mgmt(hdr->frame_control) && 492 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 493 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 494 return TX_CONTINUE; 495 } 496 497 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 498 sta->sta.addr, sta->sta.aid, ac); 499 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 500 purge_old_ps_buffers(tx->local); 501 502 /* sync with ieee80211_sta_ps_deliver_wakeup */ 503 spin_lock(&sta->ps_lock); 504 /* 505 * STA woke up the meantime and all the frames on ps_tx_buf have 506 * been queued to pending queue. No reordering can happen, go 507 * ahead and Tx the packet. 508 */ 509 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 510 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 511 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 512 spin_unlock(&sta->ps_lock); 513 return TX_CONTINUE; 514 } 515 516 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 517 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 518 ps_dbg(tx->sdata, 519 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 520 sta->sta.addr, ac); 521 ieee80211_free_txskb(&local->hw, old); 522 } else 523 tx->local->total_ps_buffered++; 524 525 info->control.jiffies = jiffies; 526 info->control.vif = &tx->sdata->vif; 527 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 528 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 529 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 530 spin_unlock(&sta->ps_lock); 531 532 if (!timer_pending(&local->sta_cleanup)) 533 mod_timer(&local->sta_cleanup, 534 round_jiffies(jiffies + 535 STA_INFO_CLEANUP_INTERVAL)); 536 537 /* 538 * We queued up some frames, so the TIM bit might 539 * need to be set, recalculate it. 540 */ 541 sta_info_recalc_tim(sta); 542 543 return TX_QUEUED; 544 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 545 ps_dbg(tx->sdata, 546 "STA %pM in PS mode, but polling/in SP -> send frame\n", 547 sta->sta.addr); 548 } 549 550 return TX_CONTINUE; 551 } 552 553 static ieee80211_tx_result debug_noinline ieee80211_tx_h_ps_buf(struct ieee80211_tx_data * tx)554 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 555 { 556 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 557 return TX_CONTINUE; 558 559 if (tx->flags & IEEE80211_TX_UNICAST) 560 return ieee80211_tx_h_unicast_ps_buf(tx); 561 else 562 return ieee80211_tx_h_multicast_ps_buf(tx); 563 } 564 565 static ieee80211_tx_result debug_noinline ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data * tx)566 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 567 { 568 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 569 570 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 571 if (tx->sdata->control_port_no_encrypt) 572 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 573 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 574 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 575 } 576 577 return TX_CONTINUE; 578 } 579 580 static struct ieee80211_key * ieee80211_select_link_key(struct ieee80211_tx_data * tx)581 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 582 { 583 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 584 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 585 struct ieee80211_link_data *link; 586 unsigned int link_id; 587 588 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 589 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 590 link = &tx->sdata->deflink; 591 } else { 592 link = rcu_dereference(tx->sdata->link[link_id]); 593 if (!link) 594 return NULL; 595 } 596 597 if (ieee80211_is_group_privacy_action(tx->skb)) 598 return rcu_dereference(link->default_multicast_key); 599 else if (ieee80211_is_mgmt(hdr->frame_control) && 600 is_multicast_ether_addr(hdr->addr1) && 601 ieee80211_is_robust_mgmt_frame(tx->skb)) 602 return rcu_dereference(link->default_mgmt_key); 603 else if (is_multicast_ether_addr(hdr->addr1)) 604 return rcu_dereference(link->default_multicast_key); 605 606 return NULL; 607 } 608 609 static ieee80211_tx_result debug_noinline ieee80211_tx_h_select_key(struct ieee80211_tx_data * tx)610 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 611 { 612 struct ieee80211_key *key; 613 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 614 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 615 616 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 617 tx->key = NULL; 618 return TX_CONTINUE; 619 } 620 621 if (tx->sta && 622 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 623 tx->key = key; 624 else if ((key = ieee80211_select_link_key(tx))) 625 tx->key = key; 626 else if (!is_multicast_ether_addr(hdr->addr1) && 627 (key = rcu_dereference(tx->sdata->default_unicast_key))) 628 tx->key = key; 629 else 630 tx->key = NULL; 631 632 if (tx->key) { 633 bool skip_hw = false; 634 635 /* TODO: add threshold stuff again */ 636 637 switch (tx->key->conf.cipher) { 638 case WLAN_CIPHER_SUITE_WEP40: 639 case WLAN_CIPHER_SUITE_WEP104: 640 case WLAN_CIPHER_SUITE_TKIP: 641 if (!ieee80211_is_data_present(hdr->frame_control)) 642 tx->key = NULL; 643 break; 644 case WLAN_CIPHER_SUITE_CCMP: 645 case WLAN_CIPHER_SUITE_CCMP_256: 646 case WLAN_CIPHER_SUITE_GCMP: 647 case WLAN_CIPHER_SUITE_GCMP_256: 648 if (!ieee80211_is_data_present(hdr->frame_control) && 649 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 650 tx->skb) && 651 !ieee80211_is_group_privacy_action(tx->skb)) 652 tx->key = NULL; 653 else 654 skip_hw = (tx->key->conf.flags & 655 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 656 ieee80211_is_mgmt(hdr->frame_control); 657 break; 658 case WLAN_CIPHER_SUITE_AES_CMAC: 659 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 660 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 661 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 662 if (!ieee80211_is_mgmt(hdr->frame_control)) 663 tx->key = NULL; 664 break; 665 } 666 667 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 668 !ieee80211_is_deauth(hdr->frame_control)) && 669 tx->skb->protocol != tx->sdata->control_port_protocol) 670 return TX_DROP; 671 672 if (!skip_hw && tx->key && 673 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 674 info->control.hw_key = &tx->key->conf; 675 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 676 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 677 return TX_DROP; 678 } 679 680 return TX_CONTINUE; 681 } 682 683 static ieee80211_tx_result debug_noinline ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data * tx)684 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 685 { 686 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 687 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 688 struct ieee80211_supported_band *sband; 689 u32 len; 690 struct ieee80211_tx_rate_control txrc; 691 struct ieee80211_sta_rates *ratetbl = NULL; 692 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 693 bool assoc = false; 694 695 memset(&txrc, 0, sizeof(txrc)); 696 697 sband = tx->local->hw.wiphy->bands[info->band]; 698 699 len = min_t(u32, tx->skb->len + FCS_LEN, 700 tx->local->hw.wiphy->frag_threshold); 701 702 /* set up the tx rate control struct we give the RC algo */ 703 txrc.hw = &tx->local->hw; 704 txrc.sband = sband; 705 txrc.bss_conf = &tx->sdata->vif.bss_conf; 706 txrc.skb = tx->skb; 707 txrc.reported_rate.idx = -1; 708 709 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 710 txrc.rate_idx_mask = ~0; 711 } else { 712 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 713 714 if (tx->sdata->rc_has_mcs_mask[info->band]) 715 txrc.rate_idx_mcs_mask = 716 tx->sdata->rc_rateidx_mcs_mask[info->band]; 717 } 718 719 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 720 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 721 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 722 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 723 724 /* set up RTS protection if desired */ 725 if (len > tx->local->hw.wiphy->rts_threshold) { 726 txrc.rts = true; 727 } 728 729 info->control.use_rts = txrc.rts; 730 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 731 732 /* 733 * Use short preamble if the BSS can handle it, but not for 734 * management frames unless we know the receiver can handle 735 * that -- the management frame might be to a station that 736 * just wants a probe response. 737 */ 738 if (tx->sdata->vif.bss_conf.use_short_preamble && 739 (ieee80211_is_tx_data(tx->skb) || 740 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 741 txrc.short_preamble = true; 742 743 info->control.short_preamble = txrc.short_preamble; 744 745 /* don't ask rate control when rate already injected via radiotap */ 746 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 747 return TX_CONTINUE; 748 749 if (tx->sta) 750 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 751 752 /* 753 * Lets not bother rate control if we're associated and cannot 754 * talk to the sta. This should not happen. 755 */ 756 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 757 !rate_usable_index_exists(sband, &tx->sta->sta), 758 "%s: Dropped data frame as no usable bitrate found while " 759 "scanning and associated. Target station: " 760 "%pM on %d GHz band\n", 761 tx->sdata->name, 762 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 763 info->band ? 5 : 2)) 764 return TX_DROP; 765 766 /* 767 * If we're associated with the sta at this point we know we can at 768 * least send the frame at the lowest bit rate. 769 */ 770 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 771 772 if (tx->sta && !info->control.skip_table) 773 ratetbl = rcu_dereference(tx->sta->sta.rates); 774 775 if (unlikely(info->control.rates[0].idx < 0)) { 776 if (ratetbl) { 777 struct ieee80211_tx_rate rate = { 778 .idx = ratetbl->rate[0].idx, 779 .flags = ratetbl->rate[0].flags, 780 .count = ratetbl->rate[0].count 781 }; 782 783 if (ratetbl->rate[0].idx < 0) 784 return TX_DROP; 785 786 tx->rate = rate; 787 } else { 788 return TX_DROP; 789 } 790 } else { 791 tx->rate = info->control.rates[0]; 792 } 793 794 if (txrc.reported_rate.idx < 0) { 795 txrc.reported_rate = tx->rate; 796 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 797 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 798 } else if (tx->sta) 799 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 800 801 if (ratetbl) 802 return TX_CONTINUE; 803 804 if (unlikely(!info->control.rates[0].count)) 805 info->control.rates[0].count = 1; 806 807 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 808 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 809 info->control.rates[0].count = 1; 810 811 return TX_CONTINUE; 812 } 813 ieee80211_tx_next_seq(struct sta_info * sta,int tid)814 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 815 { 816 u16 *seq = &sta->tid_seq[tid]; 817 __le16 ret = cpu_to_le16(*seq); 818 819 /* Increase the sequence number. */ 820 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 821 822 return ret; 823 } 824 825 static ieee80211_tx_result debug_noinline ieee80211_tx_h_sequence(struct ieee80211_tx_data * tx)826 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 827 { 828 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 829 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 830 int tid; 831 832 /* 833 * Packet injection may want to control the sequence 834 * number, if we have no matching interface then we 835 * neither assign one ourselves nor ask the driver to. 836 */ 837 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 838 return TX_CONTINUE; 839 840 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 841 return TX_CONTINUE; 842 843 if (ieee80211_hdrlen(hdr->frame_control) < 24) 844 return TX_CONTINUE; 845 846 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 847 return TX_CONTINUE; 848 849 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 850 return TX_CONTINUE; 851 852 /* SNS11 from 802.11be 10.3.2.14 */ 853 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 854 ieee80211_vif_is_mld(info->control.vif) && 855 info->control.vif->type == NL80211_IFTYPE_AP)) { 856 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 857 tx->sdata->mld_mcast_seq += 0x10; 858 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 859 return TX_CONTINUE; 860 } 861 862 /* 863 * Anything but QoS data that has a sequence number field 864 * (is long enough) gets a sequence number from the global 865 * counter. QoS data frames with a multicast destination 866 * also use the global counter (802.11-2012 9.3.2.10). 867 */ 868 if (!ieee80211_is_data_qos(hdr->frame_control) || 869 is_multicast_ether_addr(hdr->addr1)) { 870 /* driver should assign sequence number */ 871 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 872 /* for pure STA mode without beacons, we can do it */ 873 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 874 tx->sdata->sequence_number += 0x10; 875 if (tx->sta) 876 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 877 return TX_CONTINUE; 878 } 879 880 /* 881 * This should be true for injected/management frames only, for 882 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 883 * above since they are not QoS-data frames. 884 */ 885 if (!tx->sta) 886 return TX_CONTINUE; 887 888 /* include per-STA, per-TID sequence counter */ 889 tid = ieee80211_get_tid(hdr); 890 tx->sta->deflink.tx_stats.msdu[tid]++; 891 892 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 893 894 return TX_CONTINUE; 895 } 896 ieee80211_fragment(struct ieee80211_tx_data * tx,struct sk_buff * skb,int hdrlen,int frag_threshold)897 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 898 struct sk_buff *skb, int hdrlen, 899 int frag_threshold) 900 { 901 struct ieee80211_local *local = tx->local; 902 struct ieee80211_tx_info *info; 903 struct sk_buff *tmp; 904 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 905 int pos = hdrlen + per_fragm; 906 int rem = skb->len - hdrlen - per_fragm; 907 908 if (WARN_ON(rem < 0)) 909 return -EINVAL; 910 911 /* first fragment was already added to queue by caller */ 912 913 while (rem) { 914 int fraglen = per_fragm; 915 916 if (fraglen > rem) 917 fraglen = rem; 918 rem -= fraglen; 919 tmp = dev_alloc_skb(local->tx_headroom + 920 frag_threshold + 921 IEEE80211_ENCRYPT_HEADROOM + 922 IEEE80211_ENCRYPT_TAILROOM); 923 if (!tmp) 924 return -ENOMEM; 925 926 __skb_queue_tail(&tx->skbs, tmp); 927 928 skb_reserve(tmp, 929 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 930 931 /* copy control information */ 932 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 933 934 info = IEEE80211_SKB_CB(tmp); 935 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 936 IEEE80211_TX_CTL_FIRST_FRAGMENT); 937 938 if (rem) 939 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 940 941 skb_copy_queue_mapping(tmp, skb); 942 tmp->priority = skb->priority; 943 tmp->dev = skb->dev; 944 945 /* copy header and data */ 946 skb_put_data(tmp, skb->data, hdrlen); 947 skb_put_data(tmp, skb->data + pos, fraglen); 948 949 pos += fraglen; 950 } 951 952 /* adjust first fragment's length */ 953 skb_trim(skb, hdrlen + per_fragm); 954 return 0; 955 } 956 957 static ieee80211_tx_result debug_noinline ieee80211_tx_h_fragment(struct ieee80211_tx_data * tx)958 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 959 { 960 struct sk_buff *skb = tx->skb; 961 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 962 struct ieee80211_hdr *hdr = (void *)skb->data; 963 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 964 int hdrlen; 965 int fragnum; 966 967 /* no matter what happens, tx->skb moves to tx->skbs */ 968 __skb_queue_tail(&tx->skbs, skb); 969 tx->skb = NULL; 970 971 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 972 return TX_CONTINUE; 973 974 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 975 return TX_CONTINUE; 976 977 /* 978 * Warn when submitting a fragmented A-MPDU frame and drop it. 979 * This scenario is handled in ieee80211_tx_prepare but extra 980 * caution taken here as fragmented ampdu may cause Tx stop. 981 */ 982 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 983 return TX_DROP; 984 985 hdrlen = ieee80211_hdrlen(hdr->frame_control); 986 987 /* internal error, why isn't DONTFRAG set? */ 988 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 989 return TX_DROP; 990 991 /* 992 * Now fragment the frame. This will allocate all the fragments and 993 * chain them (using skb as the first fragment) to skb->next. 994 * During transmission, we will remove the successfully transmitted 995 * fragments from this list. When the low-level driver rejects one 996 * of the fragments then we will simply pretend to accept the skb 997 * but store it away as pending. 998 */ 999 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 1000 return TX_DROP; 1001 1002 /* update duration/seq/flags of fragments */ 1003 fragnum = 0; 1004 1005 skb_queue_walk(&tx->skbs, skb) { 1006 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1007 1008 hdr = (void *)skb->data; 1009 info = IEEE80211_SKB_CB(skb); 1010 1011 if (!skb_queue_is_last(&tx->skbs, skb)) { 1012 hdr->frame_control |= morefrags; 1013 /* 1014 * No multi-rate retries for fragmented frames, that 1015 * would completely throw off the NAV at other STAs. 1016 */ 1017 info->control.rates[1].idx = -1; 1018 info->control.rates[2].idx = -1; 1019 info->control.rates[3].idx = -1; 1020 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1021 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1022 } else { 1023 hdr->frame_control &= ~morefrags; 1024 } 1025 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1026 fragnum++; 1027 } 1028 1029 return TX_CONTINUE; 1030 } 1031 1032 static ieee80211_tx_result debug_noinline ieee80211_tx_h_stats(struct ieee80211_tx_data * tx)1033 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1034 { 1035 struct sk_buff *skb; 1036 int ac = -1; 1037 1038 if (!tx->sta) 1039 return TX_CONTINUE; 1040 1041 skb_queue_walk(&tx->skbs, skb) { 1042 ac = skb_get_queue_mapping(skb); 1043 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1044 } 1045 if (ac >= 0) 1046 tx->sta->deflink.tx_stats.packets[ac]++; 1047 1048 return TX_CONTINUE; 1049 } 1050 1051 static ieee80211_tx_result debug_noinline ieee80211_tx_h_encrypt(struct ieee80211_tx_data * tx)1052 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1053 { 1054 if (!tx->key) 1055 return TX_CONTINUE; 1056 1057 switch (tx->key->conf.cipher) { 1058 case WLAN_CIPHER_SUITE_WEP40: 1059 case WLAN_CIPHER_SUITE_WEP104: 1060 return ieee80211_crypto_wep_encrypt(tx); 1061 case WLAN_CIPHER_SUITE_TKIP: 1062 return ieee80211_crypto_tkip_encrypt(tx); 1063 case WLAN_CIPHER_SUITE_CCMP: 1064 return ieee80211_crypto_ccmp_encrypt( 1065 tx, IEEE80211_CCMP_MIC_LEN); 1066 case WLAN_CIPHER_SUITE_CCMP_256: 1067 return ieee80211_crypto_ccmp_encrypt( 1068 tx, IEEE80211_CCMP_256_MIC_LEN); 1069 case WLAN_CIPHER_SUITE_AES_CMAC: 1070 return ieee80211_crypto_aes_cmac_encrypt(tx); 1071 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1072 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1073 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1074 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1075 return ieee80211_crypto_aes_gmac_encrypt(tx); 1076 case WLAN_CIPHER_SUITE_GCMP: 1077 case WLAN_CIPHER_SUITE_GCMP_256: 1078 return ieee80211_crypto_gcmp_encrypt(tx); 1079 } 1080 1081 return TX_DROP; 1082 } 1083 1084 static ieee80211_tx_result debug_noinline ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data * tx)1085 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1086 { 1087 struct sk_buff *skb; 1088 struct ieee80211_hdr *hdr; 1089 int next_len; 1090 bool group_addr; 1091 1092 skb_queue_walk(&tx->skbs, skb) { 1093 hdr = (void *) skb->data; 1094 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1095 break; /* must not overwrite AID */ 1096 if (!skb_queue_is_last(&tx->skbs, skb)) { 1097 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1098 next_len = next->len; 1099 } else 1100 next_len = 0; 1101 group_addr = is_multicast_ether_addr(hdr->addr1); 1102 1103 hdr->duration_id = 1104 ieee80211_duration(tx, skb, group_addr, next_len); 1105 } 1106 1107 return TX_CONTINUE; 1108 } 1109 1110 /* actual transmit path */ 1111 ieee80211_tx_prep_agg(struct ieee80211_tx_data * tx,struct sk_buff * skb,struct ieee80211_tx_info * info,struct tid_ampdu_tx * tid_tx,int tid)1112 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1113 struct sk_buff *skb, 1114 struct ieee80211_tx_info *info, 1115 struct tid_ampdu_tx *tid_tx, 1116 int tid) 1117 { 1118 bool queued = false; 1119 bool reset_agg_timer = false; 1120 struct sk_buff *purge_skb = NULL; 1121 1122 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1123 reset_agg_timer = true; 1124 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1125 /* 1126 * nothing -- this aggregation session is being started 1127 * but that might still fail with the driver 1128 */ 1129 } else if (!tx->sta->sta.txq[tid]) { 1130 spin_lock(&tx->sta->lock); 1131 /* 1132 * Need to re-check now, because we may get here 1133 * 1134 * 1) in the window during which the setup is actually 1135 * already done, but not marked yet because not all 1136 * packets are spliced over to the driver pending 1137 * queue yet -- if this happened we acquire the lock 1138 * either before or after the splice happens, but 1139 * need to recheck which of these cases happened. 1140 * 1141 * 2) during session teardown, if the OPERATIONAL bit 1142 * was cleared due to the teardown but the pointer 1143 * hasn't been assigned NULL yet (or we loaded it 1144 * before it was assigned) -- in this case it may 1145 * now be NULL which means we should just let the 1146 * packet pass through because splicing the frames 1147 * back is already done. 1148 */ 1149 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1150 1151 if (!tid_tx) { 1152 /* do nothing, let packet pass through */ 1153 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1154 reset_agg_timer = true; 1155 } else { 1156 queued = true; 1157 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1158 clear_sta_flag(tx->sta, WLAN_STA_SP); 1159 ps_dbg(tx->sta->sdata, 1160 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1161 tx->sta->sta.addr, tx->sta->sta.aid); 1162 } 1163 info->control.vif = &tx->sdata->vif; 1164 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1165 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1166 __skb_queue_tail(&tid_tx->pending, skb); 1167 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1168 purge_skb = __skb_dequeue(&tid_tx->pending); 1169 } 1170 spin_unlock(&tx->sta->lock); 1171 1172 if (purge_skb) 1173 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1174 } 1175 1176 /* reset session timer */ 1177 if (reset_agg_timer) 1178 tid_tx->last_tx = jiffies; 1179 1180 return queued; 1181 } 1182 ieee80211_aggr_check(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1183 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1184 struct sta_info *sta, struct sk_buff *skb) 1185 { 1186 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1187 u16 tid; 1188 1189 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1190 return; 1191 1192 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1193 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1194 skb->protocol == sdata->control_port_protocol) 1195 return; 1196 1197 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1198 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1199 return; 1200 1201 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1202 } 1203 1204 /* 1205 * initialises @tx 1206 * pass %NULL for the station if unknown, a valid pointer if known 1207 * or an ERR_PTR() if the station is known not to exist 1208 */ 1209 static ieee80211_tx_result ieee80211_tx_prepare(struct ieee80211_sub_if_data * sdata,struct ieee80211_tx_data * tx,struct sta_info * sta,struct sk_buff * skb)1210 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1211 struct ieee80211_tx_data *tx, 1212 struct sta_info *sta, struct sk_buff *skb) 1213 { 1214 struct ieee80211_local *local = sdata->local; 1215 struct ieee80211_hdr *hdr; 1216 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1217 bool aggr_check = false; 1218 int tid; 1219 1220 memset(tx, 0, sizeof(*tx)); 1221 tx->skb = skb; 1222 tx->local = local; 1223 tx->sdata = sdata; 1224 __skb_queue_head_init(&tx->skbs); 1225 1226 /* 1227 * If this flag is set to true anywhere, and we get here, 1228 * we are doing the needed processing, so remove the flag 1229 * now. 1230 */ 1231 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1232 1233 hdr = (struct ieee80211_hdr *) skb->data; 1234 1235 if (likely(sta)) { 1236 if (!IS_ERR(sta)) 1237 tx->sta = sta; 1238 } else { 1239 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1240 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1241 if (!tx->sta && sdata->wdev.use_4addr) 1242 return TX_DROP; 1243 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1244 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1245 } 1246 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1247 tx->sta = sta_info_get(sdata, hdr->addr1); 1248 aggr_check = true; 1249 } 1250 } 1251 1252 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1253 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1254 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1255 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1256 struct tid_ampdu_tx *tid_tx; 1257 1258 tid = ieee80211_get_tid(hdr); 1259 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1260 if (!tid_tx && aggr_check) { 1261 ieee80211_aggr_check(sdata, tx->sta, skb); 1262 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1263 } 1264 1265 if (tid_tx) { 1266 bool queued; 1267 1268 queued = ieee80211_tx_prep_agg(tx, skb, info, 1269 tid_tx, tid); 1270 1271 if (unlikely(queued)) 1272 return TX_QUEUED; 1273 } 1274 } 1275 1276 if (is_multicast_ether_addr(hdr->addr1)) { 1277 tx->flags &= ~IEEE80211_TX_UNICAST; 1278 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1279 } else 1280 tx->flags |= IEEE80211_TX_UNICAST; 1281 1282 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1283 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1284 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1285 info->flags & IEEE80211_TX_CTL_AMPDU) 1286 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1287 } 1288 1289 if (!tx->sta) 1290 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1291 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1292 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1293 ieee80211_check_fast_xmit(tx->sta); 1294 } 1295 1296 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1297 1298 return TX_CONTINUE; 1299 } 1300 ieee80211_get_txq(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff * skb)1301 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1302 struct ieee80211_vif *vif, 1303 struct sta_info *sta, 1304 struct sk_buff *skb) 1305 { 1306 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1307 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1308 struct ieee80211_txq *txq = NULL; 1309 1310 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1311 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1312 return NULL; 1313 1314 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1315 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1316 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1317 ieee80211_is_bufferable_mmpdu(skb) || 1318 vif->type == NL80211_IFTYPE_STATION) && 1319 sta && sta->uploaded) { 1320 /* 1321 * This will be NULL if the driver didn't set the 1322 * opt-in hardware flag. 1323 */ 1324 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1325 } 1326 } else if (sta) { 1327 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1328 1329 if (!sta->uploaded) 1330 return NULL; 1331 1332 txq = sta->sta.txq[tid]; 1333 } else { 1334 txq = vif->txq; 1335 } 1336 1337 if (!txq) 1338 return NULL; 1339 1340 return to_txq_info(txq); 1341 } 1342 ieee80211_set_skb_enqueue_time(struct sk_buff * skb)1343 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1344 { 1345 struct sk_buff *next; 1346 codel_time_t now = codel_get_time(); 1347 1348 skb_list_walk_safe(skb, skb, next) 1349 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1350 } 1351 codel_skb_len_func(const struct sk_buff * skb)1352 static u32 codel_skb_len_func(const struct sk_buff *skb) 1353 { 1354 return skb->len; 1355 } 1356 codel_skb_time_func(const struct sk_buff * skb)1357 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1358 { 1359 const struct ieee80211_tx_info *info; 1360 1361 info = (const struct ieee80211_tx_info *)skb->cb; 1362 return info->control.enqueue_time; 1363 } 1364 codel_dequeue_func(struct codel_vars * cvars,void * ctx)1365 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1366 void *ctx) 1367 { 1368 struct ieee80211_local *local; 1369 struct txq_info *txqi; 1370 struct fq *fq; 1371 struct fq_flow *flow; 1372 1373 txqi = ctx; 1374 local = vif_to_sdata(txqi->txq.vif)->local; 1375 fq = &local->fq; 1376 1377 if (cvars == &txqi->def_cvars) 1378 flow = &txqi->tin.default_flow; 1379 else 1380 flow = &fq->flows[cvars - local->cvars]; 1381 1382 return fq_flow_dequeue(fq, flow); 1383 } 1384 codel_drop_func(struct sk_buff * skb,void * ctx)1385 static void codel_drop_func(struct sk_buff *skb, 1386 void *ctx) 1387 { 1388 struct ieee80211_local *local; 1389 struct ieee80211_hw *hw; 1390 struct txq_info *txqi; 1391 1392 txqi = ctx; 1393 local = vif_to_sdata(txqi->txq.vif)->local; 1394 hw = &local->hw; 1395 1396 ieee80211_free_txskb(hw, skb); 1397 } 1398 fq_tin_dequeue_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow)1399 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1400 struct fq_tin *tin, 1401 struct fq_flow *flow) 1402 { 1403 struct ieee80211_local *local; 1404 struct txq_info *txqi; 1405 struct codel_vars *cvars; 1406 struct codel_params *cparams; 1407 struct codel_stats *cstats; 1408 1409 local = container_of(fq, struct ieee80211_local, fq); 1410 txqi = container_of(tin, struct txq_info, tin); 1411 cstats = &txqi->cstats; 1412 1413 if (txqi->txq.sta) { 1414 struct sta_info *sta = container_of(txqi->txq.sta, 1415 struct sta_info, sta); 1416 cparams = &sta->cparams; 1417 } else { 1418 cparams = &local->cparams; 1419 } 1420 1421 if (flow == &tin->default_flow) 1422 cvars = &txqi->def_cvars; 1423 else 1424 cvars = &local->cvars[flow - fq->flows]; 1425 1426 return codel_dequeue(txqi, 1427 &flow->backlog, 1428 cparams, 1429 cvars, 1430 cstats, 1431 codel_skb_len_func, 1432 codel_skb_time_func, 1433 codel_drop_func, 1434 codel_dequeue_func); 1435 } 1436 fq_skb_free_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb)1437 static void fq_skb_free_func(struct fq *fq, 1438 struct fq_tin *tin, 1439 struct fq_flow *flow, 1440 struct sk_buff *skb) 1441 { 1442 struct ieee80211_local *local; 1443 1444 local = container_of(fq, struct ieee80211_local, fq); 1445 ieee80211_free_txskb(&local->hw, skb); 1446 } 1447 ieee80211_txq_enqueue(struct ieee80211_local * local,struct txq_info * txqi,struct sk_buff * skb)1448 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1449 struct txq_info *txqi, 1450 struct sk_buff *skb) 1451 { 1452 struct fq *fq = &local->fq; 1453 struct fq_tin *tin = &txqi->tin; 1454 u32 flow_idx = fq_flow_idx(fq, skb); 1455 1456 ieee80211_set_skb_enqueue_time(skb); 1457 1458 spin_lock_bh(&fq->lock); 1459 /* 1460 * For management frames, don't really apply codel etc., 1461 * we don't want to apply any shaping or anything we just 1462 * want to simplify the driver API by having them on the 1463 * txqi. 1464 */ 1465 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1466 IEEE80211_SKB_CB(skb)->control.flags |= 1467 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1468 __skb_queue_tail(&txqi->frags, skb); 1469 } else { 1470 fq_tin_enqueue(fq, tin, flow_idx, skb, 1471 fq_skb_free_func); 1472 } 1473 spin_unlock_bh(&fq->lock); 1474 } 1475 fq_vlan_filter_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb,void * data)1476 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1477 struct fq_flow *flow, struct sk_buff *skb, 1478 void *data) 1479 { 1480 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1481 1482 return info->control.vif == data; 1483 } 1484 ieee80211_txq_remove_vlan(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1485 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1486 struct ieee80211_sub_if_data *sdata) 1487 { 1488 struct fq *fq = &local->fq; 1489 struct txq_info *txqi; 1490 struct fq_tin *tin; 1491 struct ieee80211_sub_if_data *ap; 1492 1493 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1494 return; 1495 1496 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1497 1498 if (!ap->vif.txq) 1499 return; 1500 1501 txqi = to_txq_info(ap->vif.txq); 1502 tin = &txqi->tin; 1503 1504 spin_lock_bh(&fq->lock); 1505 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1506 fq_skb_free_func); 1507 spin_unlock_bh(&fq->lock); 1508 } 1509 ieee80211_txq_init(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct txq_info * txqi,int tid)1510 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1511 struct sta_info *sta, 1512 struct txq_info *txqi, int tid) 1513 { 1514 fq_tin_init(&txqi->tin); 1515 codel_vars_init(&txqi->def_cvars); 1516 codel_stats_init(&txqi->cstats); 1517 __skb_queue_head_init(&txqi->frags); 1518 INIT_LIST_HEAD(&txqi->schedule_order); 1519 1520 txqi->txq.vif = &sdata->vif; 1521 1522 if (!sta) { 1523 sdata->vif.txq = &txqi->txq; 1524 txqi->txq.tid = 0; 1525 txqi->txq.ac = IEEE80211_AC_BE; 1526 1527 return; 1528 } 1529 1530 if (tid == IEEE80211_NUM_TIDS) { 1531 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1532 /* Drivers need to opt in to the management MPDU TXQ */ 1533 if (!ieee80211_hw_check(&sdata->local->hw, 1534 STA_MMPDU_TXQ)) 1535 return; 1536 } else if (!ieee80211_hw_check(&sdata->local->hw, 1537 BUFF_MMPDU_TXQ)) { 1538 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1539 return; 1540 } 1541 txqi->txq.ac = IEEE80211_AC_VO; 1542 } else { 1543 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1544 } 1545 1546 txqi->txq.sta = &sta->sta; 1547 txqi->txq.tid = tid; 1548 sta->sta.txq[tid] = &txqi->txq; 1549 } 1550 ieee80211_txq_purge(struct ieee80211_local * local,struct txq_info * txqi)1551 void ieee80211_txq_purge(struct ieee80211_local *local, 1552 struct txq_info *txqi) 1553 { 1554 struct fq *fq = &local->fq; 1555 struct fq_tin *tin = &txqi->tin; 1556 1557 spin_lock_bh(&fq->lock); 1558 fq_tin_reset(fq, tin, fq_skb_free_func); 1559 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1560 spin_unlock_bh(&fq->lock); 1561 1562 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1563 list_del_init(&txqi->schedule_order); 1564 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1565 } 1566 ieee80211_txq_set_params(struct ieee80211_local * local)1567 void ieee80211_txq_set_params(struct ieee80211_local *local) 1568 { 1569 if (local->hw.wiphy->txq_limit) 1570 local->fq.limit = local->hw.wiphy->txq_limit; 1571 else 1572 local->hw.wiphy->txq_limit = local->fq.limit; 1573 1574 if (local->hw.wiphy->txq_memory_limit) 1575 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1576 else 1577 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1578 1579 if (local->hw.wiphy->txq_quantum) 1580 local->fq.quantum = local->hw.wiphy->txq_quantum; 1581 else 1582 local->hw.wiphy->txq_quantum = local->fq.quantum; 1583 } 1584 ieee80211_txq_setup_flows(struct ieee80211_local * local)1585 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1586 { 1587 struct fq *fq = &local->fq; 1588 int ret; 1589 int i; 1590 bool supp_vht = false; 1591 enum nl80211_band band; 1592 1593 ret = fq_init(fq, 4096); 1594 if (ret) 1595 return ret; 1596 1597 /* 1598 * If the hardware doesn't support VHT, it is safe to limit the maximum 1599 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1600 */ 1601 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1602 struct ieee80211_supported_band *sband; 1603 1604 sband = local->hw.wiphy->bands[band]; 1605 if (!sband) 1606 continue; 1607 1608 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1609 } 1610 1611 if (!supp_vht) 1612 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1613 1614 codel_params_init(&local->cparams); 1615 local->cparams.interval = MS2TIME(100); 1616 local->cparams.target = MS2TIME(20); 1617 local->cparams.ecn = true; 1618 1619 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1620 GFP_KERNEL); 1621 if (!local->cvars) { 1622 spin_lock_bh(&fq->lock); 1623 fq_reset(fq, fq_skb_free_func); 1624 spin_unlock_bh(&fq->lock); 1625 return -ENOMEM; 1626 } 1627 1628 for (i = 0; i < fq->flows_cnt; i++) 1629 codel_vars_init(&local->cvars[i]); 1630 1631 ieee80211_txq_set_params(local); 1632 1633 return 0; 1634 } 1635 ieee80211_txq_teardown_flows(struct ieee80211_local * local)1636 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1637 { 1638 struct fq *fq = &local->fq; 1639 1640 kfree(local->cvars); 1641 local->cvars = NULL; 1642 1643 spin_lock_bh(&fq->lock); 1644 fq_reset(fq, fq_skb_free_func); 1645 spin_unlock_bh(&fq->lock); 1646 } 1647 ieee80211_queue_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1648 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1649 struct ieee80211_sub_if_data *sdata, 1650 struct sta_info *sta, 1651 struct sk_buff *skb) 1652 { 1653 struct ieee80211_vif *vif; 1654 struct txq_info *txqi; 1655 1656 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1657 return false; 1658 1659 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1660 sdata = container_of(sdata->bss, 1661 struct ieee80211_sub_if_data, u.ap); 1662 1663 vif = &sdata->vif; 1664 txqi = ieee80211_get_txq(local, vif, sta, skb); 1665 1666 if (!txqi) 1667 return false; 1668 1669 ieee80211_txq_enqueue(local, txqi, skb); 1670 1671 schedule_and_wake_txq(local, txqi); 1672 1673 return true; 1674 } 1675 ieee80211_tx_frags(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff_head * skbs,bool txpending)1676 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1677 struct ieee80211_vif *vif, 1678 struct sta_info *sta, 1679 struct sk_buff_head *skbs, 1680 bool txpending) 1681 { 1682 struct ieee80211_tx_control control = {}; 1683 struct sk_buff *skb, *tmp; 1684 unsigned long flags; 1685 1686 skb_queue_walk_safe(skbs, skb, tmp) { 1687 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1688 int q = info->hw_queue; 1689 1690 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1691 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1692 __skb_unlink(skb, skbs); 1693 ieee80211_free_txskb(&local->hw, skb); 1694 continue; 1695 } 1696 #endif 1697 1698 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1699 if (local->queue_stop_reasons[q] || 1700 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1701 if (unlikely(info->flags & 1702 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1703 if (local->queue_stop_reasons[q] & 1704 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1705 /* 1706 * Drop off-channel frames if queues 1707 * are stopped for any reason other 1708 * than off-channel operation. Never 1709 * queue them. 1710 */ 1711 spin_unlock_irqrestore( 1712 &local->queue_stop_reason_lock, 1713 flags); 1714 ieee80211_purge_tx_queue(&local->hw, 1715 skbs); 1716 return true; 1717 } 1718 } else { 1719 1720 /* 1721 * Since queue is stopped, queue up frames for 1722 * later transmission from the tx-pending 1723 * tasklet when the queue is woken again. 1724 */ 1725 if (txpending) 1726 skb_queue_splice_init(skbs, 1727 &local->pending[q]); 1728 else 1729 skb_queue_splice_tail_init(skbs, 1730 &local->pending[q]); 1731 1732 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1733 flags); 1734 return false; 1735 } 1736 } 1737 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1738 1739 info->control.vif = vif; 1740 control.sta = sta ? &sta->sta : NULL; 1741 1742 __skb_unlink(skb, skbs); 1743 drv_tx(local, &control, skb); 1744 } 1745 1746 return true; 1747 } 1748 1749 /* 1750 * Returns false if the frame couldn't be transmitted but was queued instead. 1751 */ __ieee80211_tx(struct ieee80211_local * local,struct sk_buff_head * skbs,struct sta_info * sta,bool txpending)1752 static bool __ieee80211_tx(struct ieee80211_local *local, 1753 struct sk_buff_head *skbs, struct sta_info *sta, 1754 bool txpending) 1755 { 1756 struct ieee80211_tx_info *info; 1757 struct ieee80211_sub_if_data *sdata; 1758 struct ieee80211_vif *vif; 1759 struct sk_buff *skb; 1760 bool result; 1761 1762 if (WARN_ON(skb_queue_empty(skbs))) 1763 return true; 1764 1765 skb = skb_peek(skbs); 1766 info = IEEE80211_SKB_CB(skb); 1767 sdata = vif_to_sdata(info->control.vif); 1768 if (sta && !sta->uploaded) 1769 sta = NULL; 1770 1771 switch (sdata->vif.type) { 1772 case NL80211_IFTYPE_MONITOR: 1773 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1774 vif = &sdata->vif; 1775 break; 1776 } 1777 sdata = rcu_dereference(local->monitor_sdata); 1778 if (sdata) { 1779 vif = &sdata->vif; 1780 info->hw_queue = 1781 vif->hw_queue[skb_get_queue_mapping(skb)]; 1782 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1783 ieee80211_purge_tx_queue(&local->hw, skbs); 1784 return true; 1785 } else 1786 vif = NULL; 1787 break; 1788 case NL80211_IFTYPE_AP_VLAN: 1789 sdata = container_of(sdata->bss, 1790 struct ieee80211_sub_if_data, u.ap); 1791 fallthrough; 1792 default: 1793 vif = &sdata->vif; 1794 break; 1795 } 1796 1797 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1798 1799 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1800 1801 return result; 1802 } 1803 1804 /* 1805 * Invoke TX handlers, return 0 on success and non-zero if the 1806 * frame was dropped or queued. 1807 * 1808 * The handlers are split into an early and late part. The latter is everything 1809 * that can be sensitive to reordering, and will be deferred to after packets 1810 * are dequeued from the intermediate queues (when they are enabled). 1811 */ invoke_tx_handlers_early(struct ieee80211_tx_data * tx)1812 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1813 { 1814 ieee80211_tx_result res = TX_DROP; 1815 1816 #define CALL_TXH(txh) \ 1817 do { \ 1818 res = txh(tx); \ 1819 if (res != TX_CONTINUE) \ 1820 goto txh_done; \ 1821 } while (0) 1822 1823 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1824 CALL_TXH(ieee80211_tx_h_check_assoc); 1825 CALL_TXH(ieee80211_tx_h_ps_buf); 1826 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1827 CALL_TXH(ieee80211_tx_h_select_key); 1828 1829 txh_done: 1830 if (unlikely(res == TX_DROP)) { 1831 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1832 if (tx->skb) 1833 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1834 else 1835 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1836 return -1; 1837 } else if (unlikely(res == TX_QUEUED)) { 1838 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1839 return -1; 1840 } 1841 1842 return 0; 1843 } 1844 1845 /* 1846 * Late handlers can be called while the sta lock is held. Handlers that can 1847 * cause packets to be generated will cause deadlock! 1848 */ invoke_tx_handlers_late(struct ieee80211_tx_data * tx)1849 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1850 { 1851 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1852 ieee80211_tx_result res = TX_CONTINUE; 1853 1854 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1855 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1856 1857 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1858 __skb_queue_tail(&tx->skbs, tx->skb); 1859 tx->skb = NULL; 1860 goto txh_done; 1861 } 1862 1863 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1864 CALL_TXH(ieee80211_tx_h_sequence); 1865 CALL_TXH(ieee80211_tx_h_fragment); 1866 /* handlers after fragment must be aware of tx info fragmentation! */ 1867 CALL_TXH(ieee80211_tx_h_stats); 1868 CALL_TXH(ieee80211_tx_h_encrypt); 1869 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1870 CALL_TXH(ieee80211_tx_h_calculate_duration); 1871 #undef CALL_TXH 1872 1873 txh_done: 1874 if (unlikely(res == TX_DROP)) { 1875 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1876 if (tx->skb) 1877 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1878 else 1879 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1880 return -1; 1881 } else if (unlikely(res == TX_QUEUED)) { 1882 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1883 return -1; 1884 } 1885 1886 return 0; 1887 } 1888 invoke_tx_handlers(struct ieee80211_tx_data * tx)1889 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1890 { 1891 int r = invoke_tx_handlers_early(tx); 1892 1893 if (r) 1894 return r; 1895 return invoke_tx_handlers_late(tx); 1896 } 1897 ieee80211_tx_prepare_skb(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct sk_buff * skb,int band,struct ieee80211_sta ** sta)1898 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1899 struct ieee80211_vif *vif, struct sk_buff *skb, 1900 int band, struct ieee80211_sta **sta) 1901 { 1902 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1903 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1904 struct ieee80211_tx_data tx; 1905 struct sk_buff *skb2; 1906 1907 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1908 return false; 1909 1910 info->band = band; 1911 info->control.vif = vif; 1912 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1913 1914 if (invoke_tx_handlers(&tx)) 1915 return false; 1916 1917 if (sta) { 1918 if (tx.sta) 1919 *sta = &tx.sta->sta; 1920 else 1921 *sta = NULL; 1922 } 1923 1924 /* this function isn't suitable for fragmented data frames */ 1925 skb2 = __skb_dequeue(&tx.skbs); 1926 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1927 ieee80211_free_txskb(hw, skb2); 1928 ieee80211_purge_tx_queue(hw, &tx.skbs); 1929 return false; 1930 } 1931 1932 return true; 1933 } 1934 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1935 1936 /* 1937 * Returns false if the frame couldn't be transmitted but was queued instead. 1938 */ ieee80211_tx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb,bool txpending)1939 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1940 struct sta_info *sta, struct sk_buff *skb, 1941 bool txpending) 1942 { 1943 struct ieee80211_local *local = sdata->local; 1944 struct ieee80211_tx_data tx; 1945 ieee80211_tx_result res_prepare; 1946 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1947 bool result = true; 1948 1949 if (unlikely(skb->len < 10)) { 1950 dev_kfree_skb(skb); 1951 return true; 1952 } 1953 1954 /* initialises tx */ 1955 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1956 1957 if (unlikely(res_prepare == TX_DROP)) { 1958 ieee80211_free_txskb(&local->hw, skb); 1959 return true; 1960 } else if (unlikely(res_prepare == TX_QUEUED)) { 1961 return true; 1962 } 1963 1964 /* set up hw_queue value early */ 1965 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1966 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1967 info->hw_queue = 1968 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1969 1970 if (invoke_tx_handlers_early(&tx)) 1971 return true; 1972 1973 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1974 return true; 1975 1976 if (!invoke_tx_handlers_late(&tx)) 1977 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1978 1979 return result; 1980 } 1981 1982 /* device xmit handlers */ 1983 1984 enum ieee80211_encrypt { 1985 ENCRYPT_NO, 1986 ENCRYPT_MGMT, 1987 ENCRYPT_DATA, 1988 }; 1989 ieee80211_skb_resize(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int head_need,enum ieee80211_encrypt encrypt)1990 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1991 struct sk_buff *skb, 1992 int head_need, 1993 enum ieee80211_encrypt encrypt) 1994 { 1995 struct ieee80211_local *local = sdata->local; 1996 bool enc_tailroom; 1997 int tail_need = 0; 1998 1999 enc_tailroom = encrypt == ENCRYPT_MGMT || 2000 (encrypt == ENCRYPT_DATA && 2001 sdata->crypto_tx_tailroom_needed_cnt); 2002 2003 if (enc_tailroom) { 2004 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2005 tail_need -= skb_tailroom(skb); 2006 tail_need = max_t(int, tail_need, 0); 2007 } 2008 2009 if (skb_cloned(skb) && 2010 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2011 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2012 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2013 else if (head_need || tail_need) 2014 I802_DEBUG_INC(local->tx_expand_skb_head); 2015 else 2016 return 0; 2017 2018 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2019 wiphy_debug(local->hw.wiphy, 2020 "failed to reallocate TX buffer\n"); 2021 return -ENOMEM; 2022 } 2023 2024 return 0; 2025 } 2026 ieee80211_xmit(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)2027 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2028 struct sta_info *sta, struct sk_buff *skb) 2029 { 2030 struct ieee80211_local *local = sdata->local; 2031 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2032 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2033 int headroom; 2034 enum ieee80211_encrypt encrypt; 2035 2036 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2037 encrypt = ENCRYPT_NO; 2038 else if (ieee80211_is_mgmt(hdr->frame_control)) 2039 encrypt = ENCRYPT_MGMT; 2040 else 2041 encrypt = ENCRYPT_DATA; 2042 2043 headroom = local->tx_headroom; 2044 if (encrypt != ENCRYPT_NO) 2045 headroom += IEEE80211_ENCRYPT_HEADROOM; 2046 headroom -= skb_headroom(skb); 2047 headroom = max_t(int, 0, headroom); 2048 2049 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2050 ieee80211_free_txskb(&local->hw, skb); 2051 return; 2052 } 2053 2054 /* reload after potential resize */ 2055 hdr = (struct ieee80211_hdr *) skb->data; 2056 info->control.vif = &sdata->vif; 2057 2058 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2059 if (ieee80211_is_data(hdr->frame_control) && 2060 is_unicast_ether_addr(hdr->addr1)) { 2061 if (mesh_nexthop_resolve(sdata, skb)) 2062 return; /* skb queued: don't free */ 2063 } else { 2064 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2065 } 2066 } 2067 2068 ieee80211_set_qos_hdr(sdata, skb); 2069 ieee80211_tx(sdata, sta, skb, false); 2070 } 2071 ieee80211_validate_radiotap_len(struct sk_buff * skb)2072 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2073 { 2074 struct ieee80211_radiotap_header *rthdr = 2075 (struct ieee80211_radiotap_header *)skb->data; 2076 2077 /* check for not even having the fixed radiotap header part */ 2078 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2079 return false; /* too short to be possibly valid */ 2080 2081 /* is it a header version we can trust to find length from? */ 2082 if (unlikely(rthdr->it_version)) 2083 return false; /* only version 0 is supported */ 2084 2085 /* does the skb contain enough to deliver on the alleged length? */ 2086 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2087 return false; /* skb too short for claimed rt header extent */ 2088 2089 return true; 2090 } 2091 ieee80211_parse_tx_radiotap(struct sk_buff * skb,struct net_device * dev)2092 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2093 struct net_device *dev) 2094 { 2095 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2096 struct ieee80211_radiotap_iterator iterator; 2097 struct ieee80211_radiotap_header *rthdr = 2098 (struct ieee80211_radiotap_header *) skb->data; 2099 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2100 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2101 NULL); 2102 u16 txflags; 2103 u16 rate = 0; 2104 bool rate_found = false; 2105 u8 rate_retries = 0; 2106 u16 rate_flags = 0; 2107 u8 mcs_known, mcs_flags, mcs_bw; 2108 u16 vht_known; 2109 u8 vht_mcs = 0, vht_nss = 0; 2110 int i; 2111 2112 if (!ieee80211_validate_radiotap_len(skb)) 2113 return false; 2114 2115 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2116 IEEE80211_TX_CTL_DONTFRAG; 2117 2118 /* 2119 * for every radiotap entry that is present 2120 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2121 * entries present, or -EINVAL on error) 2122 */ 2123 2124 while (!ret) { 2125 ret = ieee80211_radiotap_iterator_next(&iterator); 2126 2127 if (ret) 2128 continue; 2129 2130 /* see if this argument is something we can use */ 2131 switch (iterator.this_arg_index) { 2132 /* 2133 * You must take care when dereferencing iterator.this_arg 2134 * for multibyte types... the pointer is not aligned. Use 2135 * get_unaligned((type *)iterator.this_arg) to dereference 2136 * iterator.this_arg for type "type" safely on all arches. 2137 */ 2138 case IEEE80211_RADIOTAP_FLAGS: 2139 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2140 /* 2141 * this indicates that the skb we have been 2142 * handed has the 32-bit FCS CRC at the end... 2143 * we should react to that by snipping it off 2144 * because it will be recomputed and added 2145 * on transmission 2146 */ 2147 if (skb->len < (iterator._max_length + FCS_LEN)) 2148 return false; 2149 2150 skb_trim(skb, skb->len - FCS_LEN); 2151 } 2152 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2153 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2154 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2155 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2156 break; 2157 2158 case IEEE80211_RADIOTAP_TX_FLAGS: 2159 txflags = get_unaligned_le16(iterator.this_arg); 2160 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2161 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2162 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2163 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2164 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2165 info->control.flags |= 2166 IEEE80211_TX_CTRL_DONT_REORDER; 2167 break; 2168 2169 case IEEE80211_RADIOTAP_RATE: 2170 rate = *iterator.this_arg; 2171 rate_flags = 0; 2172 rate_found = true; 2173 break; 2174 2175 case IEEE80211_RADIOTAP_DATA_RETRIES: 2176 rate_retries = *iterator.this_arg; 2177 break; 2178 2179 case IEEE80211_RADIOTAP_MCS: 2180 mcs_known = iterator.this_arg[0]; 2181 mcs_flags = iterator.this_arg[1]; 2182 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2183 break; 2184 2185 rate_found = true; 2186 rate = iterator.this_arg[2]; 2187 rate_flags = IEEE80211_TX_RC_MCS; 2188 2189 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2190 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2191 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2192 2193 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2194 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2195 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2196 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2197 2198 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2199 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2200 info->flags |= IEEE80211_TX_CTL_LDPC; 2201 2202 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2203 u8 stbc = u8_get_bits(mcs_flags, 2204 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2205 2206 info->flags |= 2207 u32_encode_bits(stbc, 2208 IEEE80211_TX_CTL_STBC); 2209 } 2210 break; 2211 2212 case IEEE80211_RADIOTAP_VHT: 2213 vht_known = get_unaligned_le16(iterator.this_arg); 2214 rate_found = true; 2215 2216 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2217 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2218 (iterator.this_arg[2] & 2219 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2220 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2221 if (vht_known & 2222 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2223 if (iterator.this_arg[3] == 1) 2224 rate_flags |= 2225 IEEE80211_TX_RC_40_MHZ_WIDTH; 2226 else if (iterator.this_arg[3] == 4) 2227 rate_flags |= 2228 IEEE80211_TX_RC_80_MHZ_WIDTH; 2229 else if (iterator.this_arg[3] == 11) 2230 rate_flags |= 2231 IEEE80211_TX_RC_160_MHZ_WIDTH; 2232 } 2233 2234 vht_mcs = iterator.this_arg[4] >> 4; 2235 if (vht_mcs > 11) 2236 vht_mcs = 0; 2237 vht_nss = iterator.this_arg[4] & 0xF; 2238 if (!vht_nss || vht_nss > 8) 2239 vht_nss = 1; 2240 break; 2241 2242 /* 2243 * Please update the file 2244 * Documentation/networking/mac80211-injection.rst 2245 * when parsing new fields here. 2246 */ 2247 2248 default: 2249 break; 2250 } 2251 } 2252 2253 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2254 return false; 2255 2256 if (rate_found) { 2257 struct ieee80211_supported_band *sband = 2258 local->hw.wiphy->bands[info->band]; 2259 2260 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2261 2262 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2263 info->control.rates[i].idx = -1; 2264 info->control.rates[i].flags = 0; 2265 info->control.rates[i].count = 0; 2266 } 2267 2268 if (rate_flags & IEEE80211_TX_RC_MCS) { 2269 info->control.rates[0].idx = rate; 2270 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2271 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2272 vht_nss); 2273 } else if (sband) { 2274 for (i = 0; i < sband->n_bitrates; i++) { 2275 if (rate * 5 != sband->bitrates[i].bitrate) 2276 continue; 2277 2278 info->control.rates[0].idx = i; 2279 break; 2280 } 2281 } 2282 2283 if (info->control.rates[0].idx < 0) 2284 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2285 2286 info->control.rates[0].flags = rate_flags; 2287 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2288 local->hw.max_rate_tries); 2289 } 2290 2291 return true; 2292 } 2293 ieee80211_monitor_start_xmit(struct sk_buff * skb,struct net_device * dev)2294 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2295 struct net_device *dev) 2296 { 2297 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2298 struct ieee80211_chanctx_conf *chanctx_conf; 2299 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2300 struct ieee80211_hdr *hdr; 2301 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2302 struct cfg80211_chan_def *chandef; 2303 u16 len_rthdr; 2304 int hdrlen; 2305 2306 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2307 if (unlikely(!ieee80211_sdata_running(sdata))) 2308 goto fail; 2309 2310 memset(info, 0, sizeof(*info)); 2311 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2312 IEEE80211_TX_CTL_INJECTED; 2313 2314 /* Sanity-check the length of the radiotap header */ 2315 if (!ieee80211_validate_radiotap_len(skb)) 2316 goto fail; 2317 2318 /* we now know there is a radiotap header with a length we can use */ 2319 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2320 2321 /* 2322 * fix up the pointers accounting for the radiotap 2323 * header still being in there. We are being given 2324 * a precooked IEEE80211 header so no need for 2325 * normal processing 2326 */ 2327 skb_set_mac_header(skb, len_rthdr); 2328 /* 2329 * these are just fixed to the end of the rt area since we 2330 * don't have any better information and at this point, nobody cares 2331 */ 2332 skb_set_network_header(skb, len_rthdr); 2333 skb_set_transport_header(skb, len_rthdr); 2334 2335 if (skb->len < len_rthdr + 2) 2336 goto fail; 2337 2338 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2339 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2340 2341 if (skb->len < len_rthdr + hdrlen) 2342 goto fail; 2343 2344 /* 2345 * Initialize skb->protocol if the injected frame is a data frame 2346 * carrying a rfc1042 header 2347 */ 2348 if (ieee80211_is_data(hdr->frame_control) && 2349 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2350 u8 *payload = (u8 *)hdr + hdrlen; 2351 2352 if (ether_addr_equal(payload, rfc1042_header)) 2353 skb->protocol = cpu_to_be16((payload[6] << 8) | 2354 payload[7]); 2355 } 2356 2357 rcu_read_lock(); 2358 2359 /* 2360 * We process outgoing injected frames that have a local address 2361 * we handle as though they are non-injected frames. 2362 * This code here isn't entirely correct, the local MAC address 2363 * isn't always enough to find the interface to use; for proper 2364 * VLAN support we have an nl80211-based mechanism. 2365 * 2366 * This is necessary, for example, for old hostapd versions that 2367 * don't use nl80211-based management TX/RX. 2368 */ 2369 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2370 if (!ieee80211_sdata_running(tmp_sdata)) 2371 continue; 2372 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2373 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2374 continue; 2375 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2376 sdata = tmp_sdata; 2377 break; 2378 } 2379 } 2380 2381 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2382 if (!chanctx_conf) { 2383 tmp_sdata = rcu_dereference(local->monitor_sdata); 2384 if (tmp_sdata) 2385 chanctx_conf = 2386 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2387 } 2388 2389 if (chanctx_conf) 2390 chandef = &chanctx_conf->def; 2391 else if (!local->use_chanctx) 2392 chandef = &local->_oper_chandef; 2393 else 2394 goto fail_rcu; 2395 2396 /* 2397 * Frame injection is not allowed if beaconing is not allowed 2398 * or if we need radar detection. Beaconing is usually not allowed when 2399 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2400 * Passive scan is also used in world regulatory domains where 2401 * your country is not known and as such it should be treated as 2402 * NO TX unless the channel is explicitly allowed in which case 2403 * your current regulatory domain would not have the passive scan 2404 * flag. 2405 * 2406 * Since AP mode uses monitor interfaces to inject/TX management 2407 * frames we can make AP mode the exception to this rule once it 2408 * supports radar detection as its implementation can deal with 2409 * radar detection by itself. We can do that later by adding a 2410 * monitor flag interfaces used for AP support. 2411 */ 2412 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2413 sdata->vif.type)) 2414 goto fail_rcu; 2415 2416 info->band = chandef->chan->band; 2417 2418 /* Initialize skb->priority according to frame type and TID class, 2419 * with respect to the sub interface that the frame will actually 2420 * be transmitted on. If the DONT_REORDER flag is set, the original 2421 * skb-priority is preserved to assure frames injected with this 2422 * flag are not reordered relative to each other. 2423 */ 2424 ieee80211_select_queue_80211(sdata, skb, hdr); 2425 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2426 2427 /* 2428 * Process the radiotap header. This will now take into account the 2429 * selected chandef above to accurately set injection rates and 2430 * retransmissions. 2431 */ 2432 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2433 goto fail_rcu; 2434 2435 /* remove the injection radiotap header */ 2436 skb_pull(skb, len_rthdr); 2437 2438 ieee80211_xmit(sdata, NULL, skb); 2439 rcu_read_unlock(); 2440 2441 return NETDEV_TX_OK; 2442 2443 fail_rcu: 2444 rcu_read_unlock(); 2445 fail: 2446 dev_kfree_skb(skb); 2447 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2448 } 2449 ieee80211_is_tdls_setup(struct sk_buff * skb)2450 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2451 { 2452 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2453 2454 return ethertype == ETH_P_TDLS && 2455 skb->len > 14 && 2456 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2457 } 2458 ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info ** sta_out)2459 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2460 struct sk_buff *skb, 2461 struct sta_info **sta_out) 2462 { 2463 struct sta_info *sta; 2464 2465 switch (sdata->vif.type) { 2466 case NL80211_IFTYPE_AP_VLAN: 2467 sta = rcu_dereference(sdata->u.vlan.sta); 2468 if (sta) { 2469 *sta_out = sta; 2470 return 0; 2471 } else if (sdata->wdev.use_4addr) { 2472 return -ENOLINK; 2473 } 2474 fallthrough; 2475 case NL80211_IFTYPE_AP: 2476 case NL80211_IFTYPE_OCB: 2477 case NL80211_IFTYPE_ADHOC: 2478 if (is_multicast_ether_addr(skb->data)) { 2479 *sta_out = ERR_PTR(-ENOENT); 2480 return 0; 2481 } 2482 sta = sta_info_get_bss(sdata, skb->data); 2483 break; 2484 #ifdef CONFIG_MAC80211_MESH 2485 case NL80211_IFTYPE_MESH_POINT: 2486 /* determined much later */ 2487 *sta_out = NULL; 2488 return 0; 2489 #endif 2490 case NL80211_IFTYPE_STATION: 2491 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2492 sta = sta_info_get(sdata, skb->data); 2493 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2494 if (test_sta_flag(sta, 2495 WLAN_STA_TDLS_PEER_AUTH)) { 2496 *sta_out = sta; 2497 return 0; 2498 } 2499 2500 /* 2501 * TDLS link during setup - throw out frames to 2502 * peer. Allow TDLS-setup frames to unauthorized 2503 * peers for the special case of a link teardown 2504 * after a TDLS sta is removed due to being 2505 * unreachable. 2506 */ 2507 if (!ieee80211_is_tdls_setup(skb)) 2508 return -EINVAL; 2509 } 2510 2511 } 2512 2513 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2514 if (!sta) 2515 return -ENOLINK; 2516 break; 2517 default: 2518 return -EINVAL; 2519 } 2520 2521 *sta_out = sta ?: ERR_PTR(-ENOENT); 2522 return 0; 2523 } 2524 ieee80211_store_ack_skb(struct ieee80211_local * local,struct sk_buff * skb,u32 * info_flags,u64 * cookie)2525 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2526 struct sk_buff *skb, 2527 u32 *info_flags, 2528 u64 *cookie) 2529 { 2530 struct sk_buff *ack_skb; 2531 u16 info_id = 0; 2532 2533 if (skb->sk) 2534 ack_skb = skb_clone_sk(skb); 2535 else 2536 ack_skb = skb_clone(skb, GFP_ATOMIC); 2537 2538 if (ack_skb) { 2539 unsigned long flags; 2540 int id; 2541 2542 spin_lock_irqsave(&local->ack_status_lock, flags); 2543 id = idr_alloc(&local->ack_status_frames, ack_skb, 2544 1, 0x2000, GFP_ATOMIC); 2545 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2546 2547 if (id >= 0) { 2548 info_id = id; 2549 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2550 if (cookie) { 2551 *cookie = ieee80211_mgmt_tx_cookie(local); 2552 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2553 } 2554 } else { 2555 kfree_skb(ack_skb); 2556 } 2557 } 2558 2559 return info_id; 2560 } 2561 2562 /** 2563 * ieee80211_build_hdr - build 802.11 header in the given frame 2564 * @sdata: virtual interface to build the header for 2565 * @skb: the skb to build the header in 2566 * @info_flags: skb flags to set 2567 * @sta: the station pointer 2568 * @ctrl_flags: info control flags to set 2569 * @cookie: cookie pointer to fill (if not %NULL) 2570 * 2571 * This function takes the skb with 802.3 header and reformats the header to 2572 * the appropriate IEEE 802.11 header based on which interface the packet is 2573 * being transmitted on. 2574 * 2575 * Note that this function also takes care of the TX status request and 2576 * potential unsharing of the SKB - this needs to be interleaved with the 2577 * header building. 2578 * 2579 * The function requires the read-side RCU lock held 2580 * 2581 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2582 */ ieee80211_build_hdr(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags,struct sta_info * sta,u32 ctrl_flags,u64 * cookie)2583 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2584 struct sk_buff *skb, u32 info_flags, 2585 struct sta_info *sta, u32 ctrl_flags, 2586 u64 *cookie) 2587 { 2588 struct ieee80211_local *local = sdata->local; 2589 struct ieee80211_tx_info *info; 2590 int head_need; 2591 u16 ethertype, hdrlen, meshhdrlen = 0; 2592 __le16 fc; 2593 struct ieee80211_hdr hdr; 2594 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2595 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2596 const u8 *encaps_data; 2597 int encaps_len, skip_header_bytes; 2598 bool wme_sta = false, authorized = false; 2599 bool tdls_peer; 2600 bool multicast; 2601 u16 info_id = 0; 2602 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2603 enum nl80211_band band; 2604 int ret; 2605 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2606 2607 if (IS_ERR(sta)) 2608 sta = NULL; 2609 2610 #ifdef CONFIG_MAC80211_DEBUGFS 2611 if (local->force_tx_status) 2612 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2613 #endif 2614 2615 /* convert Ethernet header to proper 802.11 header (based on 2616 * operation mode) */ 2617 ethertype = (skb->data[12] << 8) | skb->data[13]; 2618 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2619 2620 if (!ieee80211_vif_is_mld(&sdata->vif)) 2621 chanctx_conf = 2622 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2623 2624 switch (sdata->vif.type) { 2625 case NL80211_IFTYPE_AP_VLAN: 2626 if (sdata->wdev.use_4addr) { 2627 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2628 /* RA TA DA SA */ 2629 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2630 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2631 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2632 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2633 hdrlen = 30; 2634 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2635 wme_sta = sta->sta.wme; 2636 } 2637 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2638 struct ieee80211_sub_if_data *ap_sdata; 2639 2640 /* override chanctx_conf from AP (we don't have one) */ 2641 ap_sdata = container_of(sdata->bss, 2642 struct ieee80211_sub_if_data, 2643 u.ap); 2644 chanctx_conf = 2645 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2646 } 2647 if (sdata->wdev.use_4addr) 2648 break; 2649 fallthrough; 2650 case NL80211_IFTYPE_AP: 2651 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2652 /* DA BSSID SA */ 2653 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2654 2655 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2656 struct ieee80211_link_data *link; 2657 2658 link_id = sta->deflink.link_id; 2659 link = rcu_dereference(sdata->link[link_id]); 2660 if (WARN_ON(!link)) { 2661 ret = -ENOLINK; 2662 goto free; 2663 } 2664 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2665 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2666 (sta && sta->sta.mlo)) { 2667 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2668 } else { 2669 struct ieee80211_bss_conf *conf; 2670 2671 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2672 if (unlikely(!conf)) { 2673 ret = -ENOLINK; 2674 goto free; 2675 } 2676 2677 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2678 } 2679 2680 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2681 hdrlen = 24; 2682 break; 2683 #ifdef CONFIG_MAC80211_MESH 2684 case NL80211_IFTYPE_MESH_POINT: 2685 if (!is_multicast_ether_addr(skb->data)) { 2686 struct sta_info *next_hop; 2687 bool mpp_lookup = true; 2688 2689 mpath = mesh_path_lookup(sdata, skb->data); 2690 if (mpath) { 2691 mpp_lookup = false; 2692 next_hop = rcu_dereference(mpath->next_hop); 2693 if (!next_hop || 2694 !(mpath->flags & (MESH_PATH_ACTIVE | 2695 MESH_PATH_RESOLVING))) 2696 mpp_lookup = true; 2697 } 2698 2699 if (mpp_lookup) { 2700 mppath = mpp_path_lookup(sdata, skb->data); 2701 if (mppath) 2702 mppath->exp_time = jiffies; 2703 } 2704 2705 if (mppath && mpath) 2706 mesh_path_del(sdata, mpath->dst); 2707 } 2708 2709 /* 2710 * Use address extension if it is a packet from 2711 * another interface or if we know the destination 2712 * is being proxied by a portal (i.e. portal address 2713 * differs from proxied address) 2714 */ 2715 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2716 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2717 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2718 skb->data, skb->data + ETH_ALEN); 2719 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2720 NULL, NULL); 2721 } else { 2722 /* DS -> MBSS (802.11-2012 13.11.3.3). 2723 * For unicast with unknown forwarding information, 2724 * destination might be in the MBSS or if that fails 2725 * forwarded to another mesh gate. In either case 2726 * resolution will be handled in ieee80211_xmit(), so 2727 * leave the original DA. This also works for mcast */ 2728 const u8 *mesh_da = skb->data; 2729 2730 if (mppath) 2731 mesh_da = mppath->mpp; 2732 else if (mpath) 2733 mesh_da = mpath->dst; 2734 2735 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2736 mesh_da, sdata->vif.addr); 2737 if (is_multicast_ether_addr(mesh_da)) 2738 /* DA TA mSA AE:SA */ 2739 meshhdrlen = ieee80211_new_mesh_header( 2740 sdata, &mesh_hdr, 2741 skb->data + ETH_ALEN, NULL); 2742 else 2743 /* RA TA mDA mSA AE:DA SA */ 2744 meshhdrlen = ieee80211_new_mesh_header( 2745 sdata, &mesh_hdr, skb->data, 2746 skb->data + ETH_ALEN); 2747 2748 } 2749 2750 /* For injected frames, fill RA right away as nexthop lookup 2751 * will be skipped. 2752 */ 2753 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2754 is_zero_ether_addr(hdr.addr1)) 2755 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2756 break; 2757 #endif 2758 case NL80211_IFTYPE_STATION: 2759 /* we already did checks when looking up the RA STA */ 2760 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2761 2762 if (tdls_peer) { 2763 /* For TDLS only one link can be valid with peer STA */ 2764 int tdls_link_id = sta->sta.valid_links ? 2765 __ffs(sta->sta.valid_links) : 0; 2766 struct ieee80211_link_data *link; 2767 2768 /* DA SA BSSID */ 2769 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2770 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2771 link = rcu_dereference(sdata->link[tdls_link_id]); 2772 if (WARN_ON_ONCE(!link)) { 2773 ret = -EINVAL; 2774 goto free; 2775 } 2776 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2777 hdrlen = 24; 2778 } else if (sdata->u.mgd.use_4addr && 2779 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2780 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2781 IEEE80211_FCTL_TODS); 2782 /* RA TA DA SA */ 2783 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2784 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2785 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2786 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2787 hdrlen = 30; 2788 } else { 2789 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2790 /* BSSID SA DA */ 2791 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2792 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2793 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2794 hdrlen = 24; 2795 } 2796 break; 2797 case NL80211_IFTYPE_OCB: 2798 /* DA SA BSSID */ 2799 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2800 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2801 eth_broadcast_addr(hdr.addr3); 2802 hdrlen = 24; 2803 break; 2804 case NL80211_IFTYPE_ADHOC: 2805 /* DA SA BSSID */ 2806 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2807 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2808 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2809 hdrlen = 24; 2810 break; 2811 default: 2812 ret = -EINVAL; 2813 goto free; 2814 } 2815 2816 if (!chanctx_conf) { 2817 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2818 ret = -ENOTCONN; 2819 goto free; 2820 } 2821 /* MLD transmissions must not rely on the band */ 2822 band = 0; 2823 } else { 2824 band = chanctx_conf->def.chan->band; 2825 } 2826 2827 multicast = is_multicast_ether_addr(hdr.addr1); 2828 2829 /* sta is always NULL for mesh */ 2830 if (sta) { 2831 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2832 wme_sta = sta->sta.wme; 2833 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2834 /* For mesh, the use of the QoS header is mandatory */ 2835 wme_sta = true; 2836 } 2837 2838 /* receiver does QoS (which also means we do) use it */ 2839 if (wme_sta) { 2840 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2841 hdrlen += 2; 2842 } 2843 2844 /* 2845 * Drop unicast frames to unauthorised stations unless they are 2846 * EAPOL frames from the local station. 2847 */ 2848 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2849 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2850 !multicast && !authorized && 2851 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2852 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2853 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2854 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2855 sdata->name, hdr.addr1); 2856 #endif 2857 2858 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2859 2860 ret = -EPERM; 2861 goto free; 2862 } 2863 2864 if (unlikely(!multicast && ((skb->sk && 2865 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2866 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2867 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2868 cookie); 2869 2870 /* 2871 * If the skb is shared we need to obtain our own copy. 2872 */ 2873 skb = skb_share_check(skb, GFP_ATOMIC); 2874 if (unlikely(!skb)) { 2875 ret = -ENOMEM; 2876 goto free; 2877 } 2878 2879 hdr.frame_control = fc; 2880 hdr.duration_id = 0; 2881 hdr.seq_ctrl = 0; 2882 2883 skip_header_bytes = ETH_HLEN; 2884 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2885 encaps_data = bridge_tunnel_header; 2886 encaps_len = sizeof(bridge_tunnel_header); 2887 skip_header_bytes -= 2; 2888 } else if (ethertype >= ETH_P_802_3_MIN) { 2889 encaps_data = rfc1042_header; 2890 encaps_len = sizeof(rfc1042_header); 2891 skip_header_bytes -= 2; 2892 } else { 2893 encaps_data = NULL; 2894 encaps_len = 0; 2895 } 2896 2897 skb_pull(skb, skip_header_bytes); 2898 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2899 2900 /* 2901 * So we need to modify the skb header and hence need a copy of 2902 * that. The head_need variable above doesn't, so far, include 2903 * the needed header space that we don't need right away. If we 2904 * can, then we don't reallocate right now but only after the 2905 * frame arrives at the master device (if it does...) 2906 * 2907 * If we cannot, however, then we will reallocate to include all 2908 * the ever needed space. Also, if we need to reallocate it anyway, 2909 * make it big enough for everything we may ever need. 2910 */ 2911 2912 if (head_need > 0 || skb_cloned(skb)) { 2913 head_need += IEEE80211_ENCRYPT_HEADROOM; 2914 head_need += local->tx_headroom; 2915 head_need = max_t(int, 0, head_need); 2916 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2917 ieee80211_free_txskb(&local->hw, skb); 2918 skb = NULL; 2919 return ERR_PTR(-ENOMEM); 2920 } 2921 } 2922 2923 if (encaps_data) 2924 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2925 2926 #ifdef CONFIG_MAC80211_MESH 2927 if (meshhdrlen > 0) 2928 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2929 #endif 2930 2931 if (ieee80211_is_data_qos(fc)) { 2932 __le16 *qos_control; 2933 2934 qos_control = skb_push(skb, 2); 2935 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2936 /* 2937 * Maybe we could actually set some fields here, for now just 2938 * initialise to zero to indicate no special operation. 2939 */ 2940 *qos_control = 0; 2941 } else 2942 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2943 2944 skb_reset_mac_header(skb); 2945 2946 info = IEEE80211_SKB_CB(skb); 2947 memset(info, 0, sizeof(*info)); 2948 2949 info->flags = info_flags; 2950 info->ack_frame_id = info_id; 2951 info->band = band; 2952 2953 if (likely(!cookie)) { 2954 ctrl_flags |= u32_encode_bits(link_id, 2955 IEEE80211_TX_CTRL_MLO_LINK); 2956 } else { 2957 unsigned int pre_conf_link_id; 2958 2959 /* 2960 * ctrl_flags already have been set by 2961 * ieee80211_tx_control_port(), here 2962 * we just sanity check that 2963 */ 2964 2965 pre_conf_link_id = u32_get_bits(ctrl_flags, 2966 IEEE80211_TX_CTRL_MLO_LINK); 2967 2968 if (pre_conf_link_id != link_id && 2969 link_id != IEEE80211_LINK_UNSPECIFIED) { 2970 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2971 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2972 sdata->name, hdr.addr1, 2973 pre_conf_link_id, link_id); 2974 #endif 2975 ret = -EINVAL; 2976 goto free; 2977 } 2978 } 2979 2980 info->control.flags = ctrl_flags; 2981 2982 return skb; 2983 free: 2984 kfree_skb(skb); 2985 return ERR_PTR(ret); 2986 } 2987 2988 /* 2989 * fast-xmit overview 2990 * 2991 * The core idea of this fast-xmit is to remove per-packet checks by checking 2992 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2993 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2994 * much less work can be done per packet. For example, fragmentation must be 2995 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2996 * in the code here. 2997 * 2998 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2999 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3000 * 3001 * The most difficult part of this is that when any of these assumptions 3002 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3003 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3004 * since the per-packet code no longer checks the conditions. This is reflected 3005 * by the calls to these functions throughout the rest of the code, and must be 3006 * maintained if any of the TX path checks change. 3007 */ 3008 ieee80211_check_fast_xmit(struct sta_info * sta)3009 void ieee80211_check_fast_xmit(struct sta_info *sta) 3010 { 3011 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3012 struct ieee80211_local *local = sta->local; 3013 struct ieee80211_sub_if_data *sdata = sta->sdata; 3014 struct ieee80211_hdr *hdr = (void *)build.hdr; 3015 struct ieee80211_chanctx_conf *chanctx_conf; 3016 __le16 fc; 3017 3018 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3019 return; 3020 3021 if (ieee80211_vif_is_mesh(&sdata->vif)) 3022 mesh_fast_tx_flush_sta(sdata, sta); 3023 3024 /* Locking here protects both the pointer itself, and against concurrent 3025 * invocations winning data access races to, e.g., the key pointer that 3026 * is used. 3027 * Without it, the invocation of this function right after the key 3028 * pointer changes wouldn't be sufficient, as another CPU could access 3029 * the pointer, then stall, and then do the cache update after the CPU 3030 * that invalidated the key. 3031 * With the locking, such scenarios cannot happen as the check for the 3032 * key and the fast-tx assignment are done atomically, so the CPU that 3033 * modifies the key will either wait or other one will see the key 3034 * cleared/changed already. 3035 */ 3036 spin_lock_bh(&sta->lock); 3037 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3038 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3039 sdata->vif.type == NL80211_IFTYPE_STATION) 3040 goto out; 3041 3042 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3043 goto out; 3044 3045 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3046 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3047 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3048 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3049 goto out; 3050 3051 if (sdata->noack_map) 3052 goto out; 3053 3054 /* fast-xmit doesn't handle fragmentation at all */ 3055 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3056 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3057 goto out; 3058 3059 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3060 rcu_read_lock(); 3061 chanctx_conf = 3062 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3063 if (!chanctx_conf) { 3064 rcu_read_unlock(); 3065 goto out; 3066 } 3067 build.band = chanctx_conf->def.chan->band; 3068 rcu_read_unlock(); 3069 } else { 3070 /* MLD transmissions must not rely on the band */ 3071 build.band = 0; 3072 } 3073 3074 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3075 3076 switch (sdata->vif.type) { 3077 case NL80211_IFTYPE_ADHOC: 3078 /* DA SA BSSID */ 3079 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3080 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3081 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3082 build.hdr_len = 24; 3083 break; 3084 case NL80211_IFTYPE_STATION: 3085 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3086 /* For TDLS only one link can be valid with peer STA */ 3087 int tdls_link_id = sta->sta.valid_links ? 3088 __ffs(sta->sta.valid_links) : 0; 3089 struct ieee80211_link_data *link; 3090 3091 /* DA SA BSSID */ 3092 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3093 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3094 rcu_read_lock(); 3095 link = rcu_dereference(sdata->link[tdls_link_id]); 3096 if (!WARN_ON_ONCE(!link)) 3097 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3098 rcu_read_unlock(); 3099 build.hdr_len = 24; 3100 break; 3101 } 3102 3103 if (sdata->u.mgd.use_4addr) { 3104 /* non-regular ethertype cannot use the fastpath */ 3105 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3106 IEEE80211_FCTL_TODS); 3107 /* RA TA DA SA */ 3108 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3109 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3110 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3111 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3112 build.hdr_len = 30; 3113 break; 3114 } 3115 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3116 /* BSSID SA DA */ 3117 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3118 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3119 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3120 build.hdr_len = 24; 3121 break; 3122 case NL80211_IFTYPE_AP_VLAN: 3123 if (sdata->wdev.use_4addr) { 3124 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3125 IEEE80211_FCTL_TODS); 3126 /* RA TA DA SA */ 3127 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3128 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3129 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3130 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3131 build.hdr_len = 30; 3132 break; 3133 } 3134 fallthrough; 3135 case NL80211_IFTYPE_AP: 3136 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3137 /* DA BSSID SA */ 3138 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3139 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3140 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3141 } else { 3142 unsigned int link_id = sta->deflink.link_id; 3143 struct ieee80211_link_data *link; 3144 3145 rcu_read_lock(); 3146 link = rcu_dereference(sdata->link[link_id]); 3147 if (WARN_ON(!link)) { 3148 rcu_read_unlock(); 3149 goto out; 3150 } 3151 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3152 rcu_read_unlock(); 3153 } 3154 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3155 build.hdr_len = 24; 3156 break; 3157 default: 3158 /* not handled on fast-xmit */ 3159 goto out; 3160 } 3161 3162 if (sta->sta.wme) { 3163 build.hdr_len += 2; 3164 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3165 } 3166 3167 /* We store the key here so there's no point in using rcu_dereference() 3168 * but that's fine because the code that changes the pointers will call 3169 * this function after doing so. For a single CPU that would be enough, 3170 * for multiple see the comment above. 3171 */ 3172 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3173 if (!build.key) 3174 build.key = rcu_access_pointer(sdata->default_unicast_key); 3175 if (build.key) { 3176 bool gen_iv, iv_spc, mmic; 3177 3178 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3179 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3180 mmic = build.key->conf.flags & 3181 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3182 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3183 3184 /* don't handle software crypto */ 3185 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3186 goto out; 3187 3188 /* Key is being removed */ 3189 if (build.key->flags & KEY_FLAG_TAINTED) 3190 goto out; 3191 3192 switch (build.key->conf.cipher) { 3193 case WLAN_CIPHER_SUITE_CCMP: 3194 case WLAN_CIPHER_SUITE_CCMP_256: 3195 if (gen_iv) 3196 build.pn_offs = build.hdr_len; 3197 if (gen_iv || iv_spc) 3198 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3199 break; 3200 case WLAN_CIPHER_SUITE_GCMP: 3201 case WLAN_CIPHER_SUITE_GCMP_256: 3202 if (gen_iv) 3203 build.pn_offs = build.hdr_len; 3204 if (gen_iv || iv_spc) 3205 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3206 break; 3207 case WLAN_CIPHER_SUITE_TKIP: 3208 /* cannot handle MMIC or IV generation in xmit-fast */ 3209 if (mmic || gen_iv) 3210 goto out; 3211 if (iv_spc) 3212 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3213 break; 3214 case WLAN_CIPHER_SUITE_WEP40: 3215 case WLAN_CIPHER_SUITE_WEP104: 3216 /* cannot handle IV generation in fast-xmit */ 3217 if (gen_iv) 3218 goto out; 3219 if (iv_spc) 3220 build.hdr_len += IEEE80211_WEP_IV_LEN; 3221 break; 3222 case WLAN_CIPHER_SUITE_AES_CMAC: 3223 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3224 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3225 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3226 WARN(1, 3227 "management cipher suite 0x%x enabled for data\n", 3228 build.key->conf.cipher); 3229 goto out; 3230 default: 3231 /* we don't know how to generate IVs for this at all */ 3232 if (WARN_ON(gen_iv)) 3233 goto out; 3234 } 3235 3236 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3237 } 3238 3239 hdr->frame_control = fc; 3240 3241 memcpy(build.hdr + build.hdr_len, 3242 rfc1042_header, sizeof(rfc1042_header)); 3243 build.hdr_len += sizeof(rfc1042_header); 3244 3245 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3246 /* if the kmemdup fails, continue w/o fast_tx */ 3247 3248 out: 3249 /* we might have raced against another call to this function */ 3250 old = rcu_dereference_protected(sta->fast_tx, 3251 lockdep_is_held(&sta->lock)); 3252 rcu_assign_pointer(sta->fast_tx, fast_tx); 3253 if (old) 3254 kfree_rcu(old, rcu_head); 3255 spin_unlock_bh(&sta->lock); 3256 } 3257 ieee80211_check_fast_xmit_all(struct ieee80211_local * local)3258 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3259 { 3260 struct sta_info *sta; 3261 3262 rcu_read_lock(); 3263 list_for_each_entry_rcu(sta, &local->sta_list, list) 3264 ieee80211_check_fast_xmit(sta); 3265 rcu_read_unlock(); 3266 } 3267 ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data * sdata)3268 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3269 { 3270 struct ieee80211_local *local = sdata->local; 3271 struct sta_info *sta; 3272 3273 rcu_read_lock(); 3274 3275 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3276 if (sdata != sta->sdata && 3277 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3278 continue; 3279 ieee80211_check_fast_xmit(sta); 3280 } 3281 3282 rcu_read_unlock(); 3283 } 3284 ieee80211_clear_fast_xmit(struct sta_info * sta)3285 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3286 { 3287 struct ieee80211_fast_tx *fast_tx; 3288 3289 spin_lock_bh(&sta->lock); 3290 fast_tx = rcu_dereference_protected(sta->fast_tx, 3291 lockdep_is_held(&sta->lock)); 3292 RCU_INIT_POINTER(sta->fast_tx, NULL); 3293 spin_unlock_bh(&sta->lock); 3294 3295 if (fast_tx) 3296 kfree_rcu(fast_tx, rcu_head); 3297 } 3298 ieee80211_amsdu_realloc_pad(struct ieee80211_local * local,struct sk_buff * skb,int headroom)3299 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3300 struct sk_buff *skb, int headroom) 3301 { 3302 if (skb_headroom(skb) < headroom) { 3303 I802_DEBUG_INC(local->tx_expand_skb_head); 3304 3305 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3306 wiphy_debug(local->hw.wiphy, 3307 "failed to reallocate TX buffer\n"); 3308 return false; 3309 } 3310 } 3311 3312 return true; 3313 } 3314 ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data * sdata,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3315 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3316 struct ieee80211_fast_tx *fast_tx, 3317 struct sk_buff *skb) 3318 { 3319 struct ieee80211_local *local = sdata->local; 3320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3321 struct ieee80211_hdr *hdr; 3322 struct ethhdr *amsdu_hdr; 3323 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3324 int subframe_len = skb->len - hdr_len; 3325 void *data; 3326 u8 *qc, *h_80211_src, *h_80211_dst; 3327 const u8 *bssid; 3328 3329 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3330 return false; 3331 3332 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3333 return true; 3334 3335 if (!ieee80211_amsdu_realloc_pad(local, skb, 3336 sizeof(*amsdu_hdr) + 3337 local->hw.extra_tx_headroom)) 3338 return false; 3339 3340 data = skb_push(skb, sizeof(*amsdu_hdr)); 3341 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3342 hdr = data; 3343 amsdu_hdr = data + hdr_len; 3344 /* h_80211_src/dst is addr* field within hdr */ 3345 h_80211_src = data + fast_tx->sa_offs; 3346 h_80211_dst = data + fast_tx->da_offs; 3347 3348 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3349 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3350 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3351 3352 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3353 * fields needs to be changed to BSSID for A-MSDU frames depending 3354 * on FromDS/ToDS values. 3355 */ 3356 switch (sdata->vif.type) { 3357 case NL80211_IFTYPE_STATION: 3358 bssid = sdata->vif.cfg.ap_addr; 3359 break; 3360 case NL80211_IFTYPE_AP: 3361 case NL80211_IFTYPE_AP_VLAN: 3362 bssid = sdata->vif.addr; 3363 break; 3364 default: 3365 bssid = NULL; 3366 } 3367 3368 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3369 ether_addr_copy(h_80211_src, bssid); 3370 3371 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3372 ether_addr_copy(h_80211_dst, bssid); 3373 3374 qc = ieee80211_get_qos_ctl(hdr); 3375 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3376 3377 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3378 3379 return true; 3380 } 3381 ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb,const u8 * da,const u8 * sa)3382 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3383 struct sta_info *sta, 3384 struct ieee80211_fast_tx *fast_tx, 3385 struct sk_buff *skb, 3386 const u8 *da, const u8 *sa) 3387 { 3388 struct ieee80211_local *local = sdata->local; 3389 struct fq *fq = &local->fq; 3390 struct fq_tin *tin; 3391 struct fq_flow *flow; 3392 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3393 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3394 struct txq_info *txqi; 3395 struct sk_buff **frag_tail, *head; 3396 int subframe_len = skb->len - ETH_ALEN; 3397 u8 max_subframes = sta->sta.max_amsdu_subframes; 3398 int max_frags = local->hw.max_tx_fragments; 3399 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3400 int orig_truesize; 3401 u32 flow_idx; 3402 __be16 len; 3403 void *data; 3404 bool ret = false; 3405 unsigned int orig_len; 3406 int n = 2, nfrags, pad = 0; 3407 u16 hdrlen; 3408 3409 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3410 return false; 3411 3412 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3413 return false; 3414 3415 if (ieee80211_vif_is_mesh(&sdata->vif)) 3416 return false; 3417 3418 if (skb_is_gso(skb)) 3419 return false; 3420 3421 if (!txq) 3422 return false; 3423 3424 txqi = to_txq_info(txq); 3425 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3426 return false; 3427 3428 if (sta->sta.cur->max_rc_amsdu_len) 3429 max_amsdu_len = min_t(int, max_amsdu_len, 3430 sta->sta.cur->max_rc_amsdu_len); 3431 3432 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3433 max_amsdu_len = min_t(int, max_amsdu_len, 3434 sta->sta.cur->max_tid_amsdu_len[tid]); 3435 3436 flow_idx = fq_flow_idx(fq, skb); 3437 3438 spin_lock_bh(&fq->lock); 3439 3440 /* TODO: Ideally aggregation should be done on dequeue to remain 3441 * responsive to environment changes. 3442 */ 3443 3444 tin = &txqi->tin; 3445 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3446 head = skb_peek_tail(&flow->queue); 3447 if (!head || skb_is_gso(head)) 3448 goto out; 3449 3450 orig_truesize = head->truesize; 3451 orig_len = head->len; 3452 3453 if (skb->len + head->len > max_amsdu_len) 3454 goto out; 3455 3456 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3457 nfrags += 1 + skb_shinfo(head)->nr_frags; 3458 frag_tail = &skb_shinfo(head)->frag_list; 3459 while (*frag_tail) { 3460 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3461 frag_tail = &(*frag_tail)->next; 3462 n++; 3463 } 3464 3465 if (max_subframes && n > max_subframes) 3466 goto out; 3467 3468 if (max_frags && nfrags > max_frags) 3469 goto out; 3470 3471 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3472 goto out; 3473 3474 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3475 goto out; 3476 3477 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3478 * and frag_tail should be &skb_shinfo(head)->frag_list. 3479 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3480 * Reload frag_tail to have it pointing to the correct place. 3481 */ 3482 if (n == 2) 3483 frag_tail = &skb_shinfo(head)->frag_list; 3484 3485 /* 3486 * Pad out the previous subframe to a multiple of 4 by adding the 3487 * padding to the next one, that's being added. Note that head->len 3488 * is the length of the full A-MSDU, but that works since each time 3489 * we add a new subframe we pad out the previous one to a multiple 3490 * of 4 and thus it no longer matters in the next round. 3491 */ 3492 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3493 if ((head->len - hdrlen) & 3) 3494 pad = 4 - ((head->len - hdrlen) & 3); 3495 3496 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3497 2 + pad)) 3498 goto out_recalc; 3499 3500 ret = true; 3501 data = skb_push(skb, ETH_ALEN + 2); 3502 ether_addr_copy(data, da); 3503 ether_addr_copy(data + ETH_ALEN, sa); 3504 3505 data += 2 * ETH_ALEN; 3506 len = cpu_to_be16(subframe_len); 3507 memcpy(data, &len, 2); 3508 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3509 3510 memset(skb_push(skb, pad), 0, pad); 3511 3512 head->len += skb->len; 3513 head->data_len += skb->len; 3514 *frag_tail = skb; 3515 3516 out_recalc: 3517 fq->memory_usage += head->truesize - orig_truesize; 3518 if (head->len != orig_len) { 3519 flow->backlog += head->len - orig_len; 3520 tin->backlog_bytes += head->len - orig_len; 3521 } 3522 out: 3523 spin_unlock_bh(&fq->lock); 3524 3525 return ret; 3526 } 3527 3528 /* 3529 * Can be called while the sta lock is held. Anything that can cause packets to 3530 * be generated will cause deadlock! 3531 */ 3532 static ieee80211_tx_result ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,u8 pn_offs,struct ieee80211_key * key,struct ieee80211_tx_data * tx)3533 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3534 struct sta_info *sta, u8 pn_offs, 3535 struct ieee80211_key *key, 3536 struct ieee80211_tx_data *tx) 3537 { 3538 struct sk_buff *skb = tx->skb; 3539 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3540 struct ieee80211_hdr *hdr = (void *)skb->data; 3541 u8 tid = IEEE80211_NUM_TIDS; 3542 3543 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3544 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3545 return TX_DROP; 3546 3547 if (key) 3548 info->control.hw_key = &key->conf; 3549 3550 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3551 3552 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3553 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3554 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3555 } else { 3556 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3557 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3558 sdata->sequence_number += 0x10; 3559 } 3560 3561 if (skb_shinfo(skb)->gso_size) 3562 sta->deflink.tx_stats.msdu[tid] += 3563 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3564 else 3565 sta->deflink.tx_stats.msdu[tid]++; 3566 3567 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3568 3569 /* statistics normally done by ieee80211_tx_h_stats (but that 3570 * has to consider fragmentation, so is more complex) 3571 */ 3572 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3573 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3574 3575 if (pn_offs) { 3576 u64 pn; 3577 u8 *crypto_hdr = skb->data + pn_offs; 3578 3579 switch (key->conf.cipher) { 3580 case WLAN_CIPHER_SUITE_CCMP: 3581 case WLAN_CIPHER_SUITE_CCMP_256: 3582 case WLAN_CIPHER_SUITE_GCMP: 3583 case WLAN_CIPHER_SUITE_GCMP_256: 3584 pn = atomic64_inc_return(&key->conf.tx_pn); 3585 crypto_hdr[0] = pn; 3586 crypto_hdr[1] = pn >> 8; 3587 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3588 crypto_hdr[4] = pn >> 16; 3589 crypto_hdr[5] = pn >> 24; 3590 crypto_hdr[6] = pn >> 32; 3591 crypto_hdr[7] = pn >> 40; 3592 break; 3593 } 3594 } 3595 3596 return TX_CONTINUE; 3597 } 3598 3599 static netdev_features_t ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data * sdata)3600 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3601 { 3602 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3603 return sdata->vif.netdev_features; 3604 3605 if (!sdata->bss) 3606 return 0; 3607 3608 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3609 return sdata->vif.netdev_features; 3610 } 3611 3612 static struct sk_buff * ieee80211_tx_skb_fixup(struct sk_buff * skb,netdev_features_t features)3613 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3614 { 3615 if (skb_is_gso(skb)) { 3616 struct sk_buff *segs; 3617 3618 segs = skb_gso_segment(skb, features); 3619 if (!segs) 3620 return skb; 3621 if (IS_ERR(segs)) 3622 goto free; 3623 3624 consume_skb(skb); 3625 return segs; 3626 } 3627 3628 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3629 goto free; 3630 3631 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3632 int ofs = skb_checksum_start_offset(skb); 3633 3634 if (skb->encapsulation) 3635 skb_set_inner_transport_header(skb, ofs); 3636 else 3637 skb_set_transport_header(skb, ofs); 3638 3639 if (skb_csum_hwoffload_help(skb, features)) 3640 goto free; 3641 } 3642 3643 skb_mark_not_on_list(skb); 3644 return skb; 3645 3646 free: 3647 kfree_skb(skb); 3648 return NULL; 3649 } 3650 __ieee80211_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb,bool ampdu,const u8 * da,const u8 * sa)3651 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3652 struct sta_info *sta, 3653 struct ieee80211_fast_tx *fast_tx, 3654 struct sk_buff *skb, bool ampdu, 3655 const u8 *da, const u8 *sa) 3656 { 3657 struct ieee80211_local *local = sdata->local; 3658 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3659 struct ieee80211_tx_info *info; 3660 struct ieee80211_tx_data tx; 3661 ieee80211_tx_result r; 3662 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3663 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3664 3665 skb = skb_share_check(skb, GFP_ATOMIC); 3666 if (unlikely(!skb)) 3667 return; 3668 3669 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3670 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3671 return; 3672 3673 /* will not be crypto-handled beyond what we do here, so use false 3674 * as the may-encrypt argument for the resize to not account for 3675 * more room than we already have in 'extra_head' 3676 */ 3677 if (unlikely(ieee80211_skb_resize(sdata, skb, 3678 max_t(int, extra_head + hw_headroom - 3679 skb_headroom(skb), 0), 3680 ENCRYPT_NO))) 3681 goto free; 3682 3683 hdr = skb_push(skb, extra_head); 3684 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3685 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3686 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3687 3688 info = IEEE80211_SKB_CB(skb); 3689 memset(info, 0, sizeof(*info)); 3690 info->band = fast_tx->band; 3691 info->control.vif = &sdata->vif; 3692 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3693 IEEE80211_TX_CTL_DONTFRAG; 3694 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3695 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3696 IEEE80211_TX_CTRL_MLO_LINK); 3697 3698 #ifdef CONFIG_MAC80211_DEBUGFS 3699 if (local->force_tx_status) 3700 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3701 #endif 3702 3703 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3704 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3705 3706 *ieee80211_get_qos_ctl(hdr) = tid; 3707 } 3708 3709 __skb_queue_head_init(&tx.skbs); 3710 3711 tx.flags = IEEE80211_TX_UNICAST; 3712 tx.local = local; 3713 tx.sdata = sdata; 3714 tx.sta = sta; 3715 tx.key = fast_tx->key; 3716 3717 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3718 return; 3719 3720 tx.skb = skb; 3721 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3722 fast_tx->key, &tx); 3723 tx.skb = NULL; 3724 if (r == TX_DROP) 3725 goto free; 3726 3727 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3728 sdata = container_of(sdata->bss, 3729 struct ieee80211_sub_if_data, u.ap); 3730 3731 __skb_queue_tail(&tx.skbs, skb); 3732 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3733 return; 3734 3735 free: 3736 kfree_skb(skb); 3737 } 3738 ieee80211_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3739 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3740 struct sta_info *sta, 3741 struct ieee80211_fast_tx *fast_tx, 3742 struct sk_buff *skb) 3743 { 3744 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3745 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3746 struct tid_ampdu_tx *tid_tx = NULL; 3747 struct sk_buff *next; 3748 struct ethhdr eth; 3749 u8 tid = IEEE80211_NUM_TIDS; 3750 3751 /* control port protocol needs a lot of special handling */ 3752 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3753 return false; 3754 3755 /* only RFC 1042 SNAP */ 3756 if (ethertype < ETH_P_802_3_MIN) 3757 return false; 3758 3759 /* don't handle TX status request here either */ 3760 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3761 return false; 3762 3763 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3764 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3765 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3766 if (tid_tx) { 3767 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3768 return false; 3769 if (tid_tx->timeout) 3770 tid_tx->last_tx = jiffies; 3771 } 3772 } 3773 3774 memcpy(ð, skb->data, ETH_HLEN - 2); 3775 3776 /* after this point (skb is modified) we cannot return false */ 3777 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3778 if (!skb) 3779 return true; 3780 3781 skb_list_walk_safe(skb, skb, next) { 3782 skb_mark_not_on_list(skb); 3783 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3784 eth.h_dest, eth.h_source); 3785 } 3786 3787 return true; 3788 } 3789 ieee80211_tx_dequeue(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3790 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3791 struct ieee80211_txq *txq) 3792 { 3793 struct ieee80211_local *local = hw_to_local(hw); 3794 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3795 struct ieee80211_hdr *hdr; 3796 struct sk_buff *skb = NULL; 3797 struct fq *fq = &local->fq; 3798 struct fq_tin *tin = &txqi->tin; 3799 struct ieee80211_tx_info *info; 3800 struct ieee80211_tx_data tx; 3801 ieee80211_tx_result r; 3802 struct ieee80211_vif *vif = txq->vif; 3803 int q = vif->hw_queue[txq->ac]; 3804 unsigned long flags; 3805 bool q_stopped; 3806 3807 WARN_ON_ONCE(softirq_count() == 0); 3808 3809 if (!ieee80211_txq_airtime_check(hw, txq)) 3810 return NULL; 3811 3812 begin: 3813 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3814 q_stopped = local->queue_stop_reasons[q]; 3815 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3816 3817 if (unlikely(q_stopped)) { 3818 /* mark for waking later */ 3819 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3820 return NULL; 3821 } 3822 3823 spin_lock_bh(&fq->lock); 3824 3825 /* Make sure fragments stay together. */ 3826 skb = __skb_dequeue(&txqi->frags); 3827 if (unlikely(skb)) { 3828 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3829 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3830 goto out; 3831 IEEE80211_SKB_CB(skb)->control.flags &= 3832 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3833 } else { 3834 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3835 goto out; 3836 3837 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3838 } 3839 3840 if (!skb) 3841 goto out; 3842 3843 spin_unlock_bh(&fq->lock); 3844 3845 hdr = (struct ieee80211_hdr *)skb->data; 3846 info = IEEE80211_SKB_CB(skb); 3847 3848 memset(&tx, 0, sizeof(tx)); 3849 __skb_queue_head_init(&tx.skbs); 3850 tx.local = local; 3851 tx.skb = skb; 3852 tx.sdata = vif_to_sdata(info->control.vif); 3853 3854 if (txq->sta) { 3855 tx.sta = container_of(txq->sta, struct sta_info, sta); 3856 /* 3857 * Drop unicast frames to unauthorised stations unless they are 3858 * injected frames or EAPOL frames from the local station. 3859 */ 3860 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3861 ieee80211_is_data(hdr->frame_control) && 3862 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3863 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3864 !is_multicast_ether_addr(hdr->addr1) && 3865 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3866 (!(info->control.flags & 3867 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3868 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3869 NULL)))) { 3870 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3871 ieee80211_free_txskb(&local->hw, skb); 3872 goto begin; 3873 } 3874 } 3875 3876 /* 3877 * The key can be removed while the packet was queued, so need to call 3878 * this here to get the current key. 3879 */ 3880 r = ieee80211_tx_h_select_key(&tx); 3881 if (r != TX_CONTINUE) { 3882 ieee80211_free_txskb(&local->hw, skb); 3883 goto begin; 3884 } 3885 3886 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3887 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3888 IEEE80211_TX_CTL_DONTFRAG); 3889 3890 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3891 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3892 r = ieee80211_tx_h_rate_ctrl(&tx); 3893 if (r != TX_CONTINUE) { 3894 ieee80211_free_txskb(&local->hw, skb); 3895 goto begin; 3896 } 3897 } 3898 goto encap_out; 3899 } 3900 3901 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3902 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3903 sta); 3904 u8 pn_offs = 0; 3905 3906 if (tx.key && 3907 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3908 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3909 3910 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3911 tx.key, &tx); 3912 if (r != TX_CONTINUE) { 3913 ieee80211_free_txskb(&local->hw, skb); 3914 goto begin; 3915 } 3916 } else { 3917 if (invoke_tx_handlers_late(&tx)) 3918 goto begin; 3919 3920 skb = __skb_dequeue(&tx.skbs); 3921 info = IEEE80211_SKB_CB(skb); 3922 3923 if (!skb_queue_empty(&tx.skbs)) { 3924 spin_lock_bh(&fq->lock); 3925 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3926 spin_unlock_bh(&fq->lock); 3927 } 3928 } 3929 3930 if (skb_has_frag_list(skb) && 3931 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3932 if (skb_linearize(skb)) { 3933 ieee80211_free_txskb(&local->hw, skb); 3934 goto begin; 3935 } 3936 } 3937 3938 switch (tx.sdata->vif.type) { 3939 case NL80211_IFTYPE_MONITOR: 3940 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3941 vif = &tx.sdata->vif; 3942 break; 3943 } 3944 tx.sdata = rcu_dereference(local->monitor_sdata); 3945 if (tx.sdata) { 3946 vif = &tx.sdata->vif; 3947 info->hw_queue = 3948 vif->hw_queue[skb_get_queue_mapping(skb)]; 3949 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3950 ieee80211_free_txskb(&local->hw, skb); 3951 goto begin; 3952 } else { 3953 vif = NULL; 3954 } 3955 break; 3956 case NL80211_IFTYPE_AP_VLAN: 3957 tx.sdata = container_of(tx.sdata->bss, 3958 struct ieee80211_sub_if_data, u.ap); 3959 fallthrough; 3960 default: 3961 vif = &tx.sdata->vif; 3962 break; 3963 } 3964 3965 encap_out: 3966 info->control.vif = vif; 3967 3968 if (tx.sta && 3969 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3970 bool ampdu = txq->ac != IEEE80211_AC_VO; 3971 u32 airtime; 3972 3973 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3974 skb->len, ampdu); 3975 if (airtime) { 3976 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3977 ieee80211_sta_update_pending_airtime(local, tx.sta, 3978 txq->ac, 3979 airtime, 3980 false); 3981 } 3982 } 3983 3984 return skb; 3985 3986 out: 3987 spin_unlock_bh(&fq->lock); 3988 3989 return skb; 3990 } 3991 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3992 ieee80211_sta_deficit(struct sta_info * sta,u8 ac)3993 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3994 { 3995 struct airtime_info *air_info = &sta->airtime[ac]; 3996 3997 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3998 } 3999 4000 static void ieee80211_txq_set_active(struct txq_info * txqi)4001 ieee80211_txq_set_active(struct txq_info *txqi) 4002 { 4003 struct sta_info *sta; 4004 4005 if (!txqi->txq.sta) 4006 return; 4007 4008 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4009 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 4010 } 4011 4012 static bool ieee80211_txq_keep_active(struct txq_info * txqi)4013 ieee80211_txq_keep_active(struct txq_info *txqi) 4014 { 4015 struct sta_info *sta; 4016 u32 diff; 4017 4018 if (!txqi->txq.sta) 4019 return false; 4020 4021 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4022 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4023 return false; 4024 4025 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 4026 4027 return diff <= AIRTIME_ACTIVE_DURATION; 4028 } 4029 ieee80211_next_txq(struct ieee80211_hw * hw,u8 ac)4030 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4031 { 4032 struct ieee80211_local *local = hw_to_local(hw); 4033 struct ieee80211_txq *ret = NULL; 4034 struct txq_info *txqi = NULL, *head = NULL; 4035 bool found_eligible_txq = false; 4036 4037 spin_lock_bh(&local->active_txq_lock[ac]); 4038 4039 if (!local->schedule_round[ac]) 4040 goto out; 4041 4042 begin: 4043 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4044 struct txq_info, 4045 schedule_order); 4046 if (!txqi) 4047 goto out; 4048 4049 if (txqi == head) { 4050 if (!found_eligible_txq) 4051 goto out; 4052 else 4053 found_eligible_txq = false; 4054 } 4055 4056 if (!head) 4057 head = txqi; 4058 4059 if (txqi->txq.sta) { 4060 struct sta_info *sta = container_of(txqi->txq.sta, 4061 struct sta_info, sta); 4062 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4063 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4064 4065 if (aql_check) 4066 found_eligible_txq = true; 4067 4068 if (deficit < 0) 4069 sta->airtime[txqi->txq.ac].deficit += 4070 sta->airtime_weight; 4071 4072 if (deficit < 0 || !aql_check) { 4073 list_move_tail(&txqi->schedule_order, 4074 &local->active_txqs[txqi->txq.ac]); 4075 goto begin; 4076 } 4077 } 4078 4079 if (txqi->schedule_round == local->schedule_round[ac]) 4080 goto out; 4081 4082 list_del_init(&txqi->schedule_order); 4083 txqi->schedule_round = local->schedule_round[ac]; 4084 ret = &txqi->txq; 4085 4086 out: 4087 spin_unlock_bh(&local->active_txq_lock[ac]); 4088 return ret; 4089 } 4090 EXPORT_SYMBOL(ieee80211_next_txq); 4091 __ieee80211_schedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool force)4092 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4093 struct ieee80211_txq *txq, 4094 bool force) 4095 { 4096 struct ieee80211_local *local = hw_to_local(hw); 4097 struct txq_info *txqi = to_txq_info(txq); 4098 bool has_queue; 4099 4100 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4101 4102 has_queue = force || txq_has_queue(txq); 4103 if (list_empty(&txqi->schedule_order) && 4104 (has_queue || ieee80211_txq_keep_active(txqi))) { 4105 /* If airtime accounting is active, always enqueue STAs at the 4106 * head of the list to ensure that they only get moved to the 4107 * back by the airtime DRR scheduler once they have a negative 4108 * deficit. A station that already has a negative deficit will 4109 * get immediately moved to the back of the list on the next 4110 * call to ieee80211_next_txq(). 4111 */ 4112 if (txqi->txq.sta && local->airtime_flags && has_queue && 4113 wiphy_ext_feature_isset(local->hw.wiphy, 4114 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4115 list_add(&txqi->schedule_order, 4116 &local->active_txqs[txq->ac]); 4117 else 4118 list_add_tail(&txqi->schedule_order, 4119 &local->active_txqs[txq->ac]); 4120 if (has_queue) 4121 ieee80211_txq_set_active(txqi); 4122 } 4123 4124 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4125 } 4126 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4127 4128 DEFINE_STATIC_KEY_FALSE(aql_disable); 4129 ieee80211_txq_airtime_check(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4130 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4131 struct ieee80211_txq *txq) 4132 { 4133 struct sta_info *sta; 4134 struct ieee80211_local *local = hw_to_local(hw); 4135 4136 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4137 return true; 4138 4139 if (static_branch_unlikely(&aql_disable)) 4140 return true; 4141 4142 if (!txq->sta) 4143 return true; 4144 4145 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4146 return true; 4147 4148 sta = container_of(txq->sta, struct sta_info, sta); 4149 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4150 sta->airtime[txq->ac].aql_limit_low) 4151 return true; 4152 4153 if (atomic_read(&local->aql_total_pending_airtime) < 4154 local->aql_threshold && 4155 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4156 sta->airtime[txq->ac].aql_limit_high) 4157 return true; 4158 4159 return false; 4160 } 4161 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4162 4163 static bool ieee80211_txq_schedule_airtime_check(struct ieee80211_local * local,u8 ac)4164 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4165 { 4166 unsigned int num_txq = 0; 4167 struct txq_info *txq; 4168 u32 aql_limit; 4169 4170 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4171 return true; 4172 4173 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4174 num_txq++; 4175 4176 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4177 local->aql_txq_limit_high[ac]; 4178 4179 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4180 } 4181 ieee80211_txq_may_transmit(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4182 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4183 struct ieee80211_txq *txq) 4184 { 4185 struct ieee80211_local *local = hw_to_local(hw); 4186 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4187 struct sta_info *sta; 4188 u8 ac = txq->ac; 4189 4190 spin_lock_bh(&local->active_txq_lock[ac]); 4191 4192 if (!txqi->txq.sta) 4193 goto out; 4194 4195 if (list_empty(&txqi->schedule_order)) 4196 goto out; 4197 4198 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4199 goto out; 4200 4201 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4202 schedule_order) { 4203 if (iter == txqi) 4204 break; 4205 4206 if (!iter->txq.sta) { 4207 list_move_tail(&iter->schedule_order, 4208 &local->active_txqs[ac]); 4209 continue; 4210 } 4211 sta = container_of(iter->txq.sta, struct sta_info, sta); 4212 if (ieee80211_sta_deficit(sta, ac) < 0) 4213 sta->airtime[ac].deficit += sta->airtime_weight; 4214 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4215 } 4216 4217 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4218 if (sta->airtime[ac].deficit >= 0) 4219 goto out; 4220 4221 sta->airtime[ac].deficit += sta->airtime_weight; 4222 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4223 spin_unlock_bh(&local->active_txq_lock[ac]); 4224 4225 return false; 4226 out: 4227 if (!list_empty(&txqi->schedule_order)) 4228 list_del_init(&txqi->schedule_order); 4229 spin_unlock_bh(&local->active_txq_lock[ac]); 4230 4231 return true; 4232 } 4233 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4234 ieee80211_txq_schedule_start(struct ieee80211_hw * hw,u8 ac)4235 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4236 { 4237 struct ieee80211_local *local = hw_to_local(hw); 4238 4239 spin_lock_bh(&local->active_txq_lock[ac]); 4240 4241 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4242 local->schedule_round[ac]++; 4243 if (!local->schedule_round[ac]) 4244 local->schedule_round[ac]++; 4245 } else { 4246 local->schedule_round[ac] = 0; 4247 } 4248 4249 spin_unlock_bh(&local->active_txq_lock[ac]); 4250 } 4251 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4252 __ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev,u32 info_flags,u32 ctrl_flags,u64 * cookie)4253 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4254 struct net_device *dev, 4255 u32 info_flags, 4256 u32 ctrl_flags, 4257 u64 *cookie) 4258 { 4259 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4260 struct ieee80211_local *local = sdata->local; 4261 struct sta_info *sta; 4262 struct sk_buff *next; 4263 int len = skb->len; 4264 4265 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4266 kfree_skb(skb); 4267 return; 4268 } 4269 4270 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4271 4272 rcu_read_lock(); 4273 4274 if (ieee80211_vif_is_mesh(&sdata->vif) && 4275 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4276 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4277 goto out; 4278 4279 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4280 goto out_free; 4281 4282 if (IS_ERR(sta)) 4283 sta = NULL; 4284 4285 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4286 ieee80211_aggr_check(sdata, sta, skb); 4287 4288 if (sta) { 4289 struct ieee80211_fast_tx *fast_tx; 4290 4291 fast_tx = rcu_dereference(sta->fast_tx); 4292 4293 if (fast_tx && 4294 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4295 goto out; 4296 } 4297 4298 /* the frame could be fragmented, software-encrypted, and other 4299 * things so we cannot really handle checksum or GSO offload. 4300 * fix it up in software before we handle anything else. 4301 */ 4302 skb = ieee80211_tx_skb_fixup(skb, 0); 4303 if (!skb) { 4304 len = 0; 4305 goto out; 4306 } 4307 4308 skb_list_walk_safe(skb, skb, next) { 4309 skb_mark_not_on_list(skb); 4310 4311 if (skb->protocol == sdata->control_port_protocol) 4312 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4313 4314 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4315 sta, ctrl_flags, cookie); 4316 if (IS_ERR(skb)) { 4317 kfree_skb_list(next); 4318 goto out; 4319 } 4320 4321 dev_sw_netstats_tx_add(dev, 1, skb->len); 4322 4323 ieee80211_xmit(sdata, sta, skb); 4324 } 4325 goto out; 4326 out_free: 4327 kfree_skb(skb); 4328 len = 0; 4329 out: 4330 if (len) 4331 ieee80211_tpt_led_trig_tx(local, len); 4332 rcu_read_unlock(); 4333 } 4334 ieee80211_change_da(struct sk_buff * skb,struct sta_info * sta)4335 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4336 { 4337 struct ethhdr *eth; 4338 int err; 4339 4340 err = skb_ensure_writable(skb, ETH_HLEN); 4341 if (unlikely(err)) 4342 return err; 4343 4344 eth = (void *)skb->data; 4345 ether_addr_copy(eth->h_dest, sta->sta.addr); 4346 4347 return 0; 4348 } 4349 ieee80211_multicast_to_unicast(struct sk_buff * skb,struct net_device * dev)4350 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4351 struct net_device *dev) 4352 { 4353 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4354 const struct ethhdr *eth = (void *)skb->data; 4355 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4356 __be16 ethertype; 4357 4358 switch (sdata->vif.type) { 4359 case NL80211_IFTYPE_AP_VLAN: 4360 if (sdata->u.vlan.sta) 4361 return false; 4362 if (sdata->wdev.use_4addr) 4363 return false; 4364 fallthrough; 4365 case NL80211_IFTYPE_AP: 4366 /* check runtime toggle for this bss */ 4367 if (!sdata->bss->multicast_to_unicast) 4368 return false; 4369 break; 4370 default: 4371 return false; 4372 } 4373 4374 /* multicast to unicast conversion only for some payload */ 4375 ethertype = eth->h_proto; 4376 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4377 ethertype = ethvlan->h_vlan_encapsulated_proto; 4378 switch (ethertype) { 4379 case htons(ETH_P_ARP): 4380 case htons(ETH_P_IP): 4381 case htons(ETH_P_IPV6): 4382 break; 4383 default: 4384 return false; 4385 } 4386 4387 return true; 4388 } 4389 4390 static void ieee80211_convert_to_unicast(struct sk_buff * skb,struct net_device * dev,struct sk_buff_head * queue)4391 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4392 struct sk_buff_head *queue) 4393 { 4394 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4395 struct ieee80211_local *local = sdata->local; 4396 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4397 struct sta_info *sta, *first = NULL; 4398 struct sk_buff *cloned_skb; 4399 4400 rcu_read_lock(); 4401 4402 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4403 if (sdata != sta->sdata) 4404 /* AP-VLAN mismatch */ 4405 continue; 4406 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4407 /* do not send back to source */ 4408 continue; 4409 if (!first) { 4410 first = sta; 4411 continue; 4412 } 4413 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4414 if (!cloned_skb) 4415 goto multicast; 4416 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4417 dev_kfree_skb(cloned_skb); 4418 goto multicast; 4419 } 4420 __skb_queue_tail(queue, cloned_skb); 4421 } 4422 4423 if (likely(first)) { 4424 if (unlikely(ieee80211_change_da(skb, first))) 4425 goto multicast; 4426 __skb_queue_tail(queue, skb); 4427 } else { 4428 /* no STA connected, drop */ 4429 kfree_skb(skb); 4430 skb = NULL; 4431 } 4432 4433 goto out; 4434 multicast: 4435 __skb_queue_purge(queue); 4436 __skb_queue_tail(queue, skb); 4437 out: 4438 rcu_read_unlock(); 4439 } 4440 ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 ctrl_flags,unsigned int link_id)4441 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4442 struct sk_buff *skb, u32 ctrl_flags, 4443 unsigned int link_id) 4444 { 4445 struct sk_buff *out; 4446 4447 out = skb_copy(skb, GFP_ATOMIC); 4448 if (!out) 4449 return; 4450 4451 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4452 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4453 } 4454 ieee80211_mlo_multicast_tx(struct net_device * dev,struct sk_buff * skb)4455 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4456 struct sk_buff *skb) 4457 { 4458 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4459 unsigned long links = sdata->vif.active_links; 4460 unsigned int link; 4461 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4462 4463 if (hweight16(links) == 1) { 4464 ctrl_flags |= u32_encode_bits(__ffs(links), 4465 IEEE80211_TX_CTRL_MLO_LINK); 4466 4467 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4468 NULL); 4469 return; 4470 } 4471 4472 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4473 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4474 ctrl_flags = 0; 4475 } 4476 kfree_skb(skb); 4477 } 4478 4479 /** 4480 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4481 * @skb: packet to be sent 4482 * @dev: incoming interface 4483 * 4484 * On failure skb will be freed. 4485 */ ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev)4486 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4487 struct net_device *dev) 4488 { 4489 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4490 const struct ethhdr *eth = (void *)skb->data; 4491 4492 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4493 goto normal; 4494 4495 if (unlikely(!ieee80211_sdata_running(sdata))) { 4496 kfree_skb(skb); 4497 return NETDEV_TX_OK; 4498 } 4499 4500 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4501 struct sk_buff_head queue; 4502 4503 __skb_queue_head_init(&queue); 4504 ieee80211_convert_to_unicast(skb, dev, &queue); 4505 while ((skb = __skb_dequeue(&queue))) 4506 __ieee80211_subif_start_xmit(skb, dev, 0, 4507 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4508 NULL); 4509 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4510 sdata->vif.type == NL80211_IFTYPE_AP && 4511 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4512 ieee80211_mlo_multicast_tx(dev, skb); 4513 } else { 4514 normal: 4515 __ieee80211_subif_start_xmit(skb, dev, 0, 4516 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4517 NULL); 4518 } 4519 4520 return NETDEV_TX_OK; 4521 } 4522 4523 4524 __ieee80211_tx_8023(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info * sta,bool txpending)4525 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4526 struct sk_buff *skb, struct sta_info *sta, 4527 bool txpending) 4528 { 4529 struct ieee80211_local *local = sdata->local; 4530 struct ieee80211_tx_control control = {}; 4531 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4532 struct ieee80211_sta *pubsta = NULL; 4533 unsigned long flags; 4534 int q = info->hw_queue; 4535 4536 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4537 4538 if (local->queue_stop_reasons[q] || 4539 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4540 if (txpending) 4541 skb_queue_head(&local->pending[q], skb); 4542 else 4543 skb_queue_tail(&local->pending[q], skb); 4544 4545 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4546 4547 return false; 4548 } 4549 4550 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4551 4552 if (sta && sta->uploaded) 4553 pubsta = &sta->sta; 4554 4555 control.sta = pubsta; 4556 4557 drv_tx(local, &control, skb); 4558 4559 return true; 4560 } 4561 ieee80211_tx_8023(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info * sta,bool txpending)4562 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4563 struct sk_buff *skb, struct sta_info *sta, 4564 bool txpending) 4565 { 4566 struct ieee80211_local *local = sdata->local; 4567 struct sk_buff *next; 4568 bool ret = true; 4569 4570 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4571 return true; 4572 4573 skb_list_walk_safe(skb, skb, next) { 4574 skb_mark_not_on_list(skb); 4575 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4576 ret = false; 4577 } 4578 4579 return ret; 4580 } 4581 ieee80211_8023_xmit(struct ieee80211_sub_if_data * sdata,struct net_device * dev,struct sta_info * sta,struct ieee80211_key * key,struct sk_buff * skb)4582 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4583 struct net_device *dev, struct sta_info *sta, 4584 struct ieee80211_key *key, struct sk_buff *skb) 4585 { 4586 struct ieee80211_tx_info *info; 4587 struct ieee80211_local *local = sdata->local; 4588 struct tid_ampdu_tx *tid_tx; 4589 struct sk_buff *seg, *next; 4590 unsigned int skbs = 0, len = 0; 4591 u16 queue; 4592 u8 tid; 4593 4594 queue = ieee80211_select_queue(sdata, sta, skb); 4595 skb_set_queue_mapping(skb, queue); 4596 4597 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4598 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4599 goto out_free; 4600 4601 skb = skb_share_check(skb, GFP_ATOMIC); 4602 if (unlikely(!skb)) 4603 return; 4604 4605 ieee80211_aggr_check(sdata, sta, skb); 4606 4607 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4608 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4609 if (tid_tx) { 4610 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4611 /* fall back to non-offload slow path */ 4612 __ieee80211_subif_start_xmit(skb, dev, 0, 4613 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4614 NULL); 4615 return; 4616 } 4617 4618 if (tid_tx->timeout) 4619 tid_tx->last_tx = jiffies; 4620 } 4621 4622 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4623 if (!skb) 4624 return; 4625 4626 info = IEEE80211_SKB_CB(skb); 4627 memset(info, 0, sizeof(*info)); 4628 4629 info->hw_queue = sdata->vif.hw_queue[queue]; 4630 4631 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4632 sdata = container_of(sdata->bss, 4633 struct ieee80211_sub_if_data, u.ap); 4634 4635 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4636 info->control.vif = &sdata->vif; 4637 4638 if (key) 4639 info->control.hw_key = &key->conf; 4640 4641 skb_list_walk_safe(skb, seg, next) { 4642 skbs++; 4643 len += seg->len; 4644 if (seg != skb) 4645 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4646 } 4647 4648 if (unlikely(skb->sk && 4649 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4650 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4651 &info->flags, NULL); 4652 4653 dev_sw_netstats_tx_add(dev, skbs, len); 4654 sta->deflink.tx_stats.packets[queue] += skbs; 4655 sta->deflink.tx_stats.bytes[queue] += len; 4656 4657 ieee80211_tpt_led_trig_tx(local, len); 4658 4659 ieee80211_tx_8023(sdata, skb, sta, false); 4660 4661 return; 4662 4663 out_free: 4664 kfree_skb(skb); 4665 } 4666 ieee80211_subif_start_xmit_8023(struct sk_buff * skb,struct net_device * dev)4667 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4668 struct net_device *dev) 4669 { 4670 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4671 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4672 struct ieee80211_key *key; 4673 struct sta_info *sta; 4674 4675 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4676 kfree_skb(skb); 4677 return NETDEV_TX_OK; 4678 } 4679 4680 rcu_read_lock(); 4681 4682 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4683 kfree_skb(skb); 4684 goto out; 4685 } 4686 4687 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4688 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4689 sdata->control_port_protocol == ehdr->h_proto)) 4690 goto skip_offload; 4691 4692 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4693 if (!key) 4694 key = rcu_dereference(sdata->default_unicast_key); 4695 4696 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4697 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4698 goto skip_offload; 4699 4700 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4701 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4702 goto out; 4703 4704 skip_offload: 4705 ieee80211_subif_start_xmit(skb, dev); 4706 out: 4707 rcu_read_unlock(); 4708 4709 return NETDEV_TX_OK; 4710 } 4711 4712 struct sk_buff * ieee80211_build_data_template(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags)4713 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4714 struct sk_buff *skb, u32 info_flags) 4715 { 4716 struct ieee80211_hdr *hdr; 4717 struct ieee80211_tx_data tx = { 4718 .local = sdata->local, 4719 .sdata = sdata, 4720 }; 4721 struct sta_info *sta; 4722 4723 rcu_read_lock(); 4724 4725 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4726 kfree_skb(skb); 4727 skb = ERR_PTR(-EINVAL); 4728 goto out; 4729 } 4730 4731 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4732 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4733 if (IS_ERR(skb)) 4734 goto out; 4735 4736 hdr = (void *)skb->data; 4737 tx.sta = sta_info_get(sdata, hdr->addr1); 4738 tx.skb = skb; 4739 4740 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4741 rcu_read_unlock(); 4742 kfree_skb(skb); 4743 return ERR_PTR(-EINVAL); 4744 } 4745 4746 out: 4747 rcu_read_unlock(); 4748 return skb; 4749 } 4750 4751 /* 4752 * ieee80211_clear_tx_pending may not be called in a context where 4753 * it is possible that it packets could come in again. 4754 */ ieee80211_clear_tx_pending(struct ieee80211_local * local)4755 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4756 { 4757 struct sk_buff *skb; 4758 int i; 4759 4760 for (i = 0; i < local->hw.queues; i++) { 4761 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4762 ieee80211_free_txskb(&local->hw, skb); 4763 } 4764 } 4765 4766 /* 4767 * Returns false if the frame couldn't be transmitted but was queued instead, 4768 * which in this case means re-queued -- take as an indication to stop sending 4769 * more pending frames. 4770 */ ieee80211_tx_pending_skb(struct ieee80211_local * local,struct sk_buff * skb)4771 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4772 struct sk_buff *skb) 4773 { 4774 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4775 struct ieee80211_sub_if_data *sdata; 4776 struct sta_info *sta; 4777 struct ieee80211_hdr *hdr; 4778 bool result; 4779 struct ieee80211_chanctx_conf *chanctx_conf; 4780 4781 sdata = vif_to_sdata(info->control.vif); 4782 4783 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4784 /* update band only for non-MLD */ 4785 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4786 chanctx_conf = 4787 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4788 if (unlikely(!chanctx_conf)) { 4789 dev_kfree_skb(skb); 4790 return true; 4791 } 4792 info->band = chanctx_conf->def.chan->band; 4793 } 4794 result = ieee80211_tx(sdata, NULL, skb, true); 4795 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4796 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4797 dev_kfree_skb(skb); 4798 return true; 4799 } 4800 4801 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4802 sta = NULL; 4803 4804 result = ieee80211_tx_8023(sdata, skb, sta, true); 4805 } else { 4806 struct sk_buff_head skbs; 4807 4808 __skb_queue_head_init(&skbs); 4809 __skb_queue_tail(&skbs, skb); 4810 4811 hdr = (struct ieee80211_hdr *)skb->data; 4812 sta = sta_info_get(sdata, hdr->addr1); 4813 4814 result = __ieee80211_tx(local, &skbs, sta, true); 4815 } 4816 4817 return result; 4818 } 4819 4820 /* 4821 * Transmit all pending packets. Called from tasklet. 4822 */ ieee80211_tx_pending(struct tasklet_struct * t)4823 void ieee80211_tx_pending(struct tasklet_struct *t) 4824 { 4825 struct ieee80211_local *local = from_tasklet(local, t, 4826 tx_pending_tasklet); 4827 unsigned long flags; 4828 int i; 4829 bool txok; 4830 4831 rcu_read_lock(); 4832 4833 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4834 for (i = 0; i < local->hw.queues; i++) { 4835 /* 4836 * If queue is stopped by something other than due to pending 4837 * frames, or we have no pending frames, proceed to next queue. 4838 */ 4839 if (local->queue_stop_reasons[i] || 4840 skb_queue_empty(&local->pending[i])) 4841 continue; 4842 4843 while (!skb_queue_empty(&local->pending[i])) { 4844 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4845 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4846 4847 if (WARN_ON(!info->control.vif)) { 4848 ieee80211_free_txskb(&local->hw, skb); 4849 continue; 4850 } 4851 4852 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4853 flags); 4854 4855 txok = ieee80211_tx_pending_skb(local, skb); 4856 spin_lock_irqsave(&local->queue_stop_reason_lock, 4857 flags); 4858 if (!txok) 4859 break; 4860 } 4861 } 4862 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4863 4864 rcu_read_unlock(); 4865 } 4866 4867 /* functions for drivers to get certain frames */ 4868 __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link,struct ps_data * ps,struct sk_buff * skb,bool is_template)4869 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4870 struct ieee80211_link_data *link, 4871 struct ps_data *ps, struct sk_buff *skb, 4872 bool is_template) 4873 { 4874 u8 *pos, *tim; 4875 int aid0 = 0; 4876 int i, have_bits = 0, n1, n2; 4877 struct ieee80211_bss_conf *link_conf = link->conf; 4878 4879 /* Generate bitmap for TIM only if there are any STAs in power save 4880 * mode. */ 4881 if (atomic_read(&ps->num_sta_ps) > 0) 4882 /* in the hope that this is faster than 4883 * checking byte-for-byte */ 4884 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4885 IEEE80211_MAX_AID+1); 4886 if (!is_template) { 4887 if (ps->dtim_count == 0) 4888 ps->dtim_count = link_conf->dtim_period - 1; 4889 else 4890 ps->dtim_count--; 4891 } 4892 4893 tim = pos = skb_put(skb, 5); 4894 *pos++ = WLAN_EID_TIM; 4895 *pos++ = 3; 4896 *pos++ = ps->dtim_count; 4897 *pos++ = link_conf->dtim_period; 4898 4899 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4900 aid0 = 1; 4901 4902 ps->dtim_bc_mc = aid0 == 1; 4903 4904 if (have_bits) { 4905 /* Find largest even number N1 so that bits numbered 1 through 4906 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4907 * (N2 + 1) x 8 through 2007 are 0. */ 4908 n1 = 0; 4909 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4910 if (ps->tim[i]) { 4911 n1 = i & 0xfe; 4912 break; 4913 } 4914 } 4915 n2 = n1; 4916 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4917 if (ps->tim[i]) { 4918 n2 = i; 4919 break; 4920 } 4921 } 4922 4923 /* Bitmap control */ 4924 *pos++ = n1 | aid0; 4925 /* Part Virt Bitmap */ 4926 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4927 4928 tim[1] = n2 - n1 + 4; 4929 } else { 4930 *pos++ = aid0; /* Bitmap control */ 4931 4932 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4933 tim[1] = 4; 4934 /* Part Virt Bitmap */ 4935 skb_put_u8(skb, 0); 4936 } 4937 } 4938 } 4939 ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link,struct ps_data * ps,struct sk_buff * skb,bool is_template)4940 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4941 struct ieee80211_link_data *link, 4942 struct ps_data *ps, struct sk_buff *skb, 4943 bool is_template) 4944 { 4945 struct ieee80211_local *local = sdata->local; 4946 4947 /* 4948 * Not very nice, but we want to allow the driver to call 4949 * ieee80211_beacon_get() as a response to the set_tim() 4950 * callback. That, however, is already invoked under the 4951 * sta_lock to guarantee consistent and race-free update 4952 * of the tim bitmap in mac80211 and the driver. 4953 */ 4954 if (local->tim_in_locked_section) { 4955 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4956 } else { 4957 spin_lock_bh(&local->tim_lock); 4958 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4959 spin_unlock_bh(&local->tim_lock); 4960 } 4961 4962 return 0; 4963 } 4964 ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data * sdata,struct beacon_data * beacon,struct ieee80211_link_data * link)4965 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4966 struct beacon_data *beacon, 4967 struct ieee80211_link_data *link) 4968 { 4969 u8 *beacon_data, count, max_count = 1; 4970 struct probe_resp *resp; 4971 size_t beacon_data_len; 4972 u16 *bcn_offsets; 4973 int i; 4974 4975 switch (sdata->vif.type) { 4976 case NL80211_IFTYPE_AP: 4977 beacon_data = beacon->tail; 4978 beacon_data_len = beacon->tail_len; 4979 break; 4980 case NL80211_IFTYPE_ADHOC: 4981 beacon_data = beacon->head; 4982 beacon_data_len = beacon->head_len; 4983 break; 4984 case NL80211_IFTYPE_MESH_POINT: 4985 beacon_data = beacon->head; 4986 beacon_data_len = beacon->head_len; 4987 break; 4988 default: 4989 return; 4990 } 4991 4992 resp = rcu_dereference(link->u.ap.probe_resp); 4993 4994 bcn_offsets = beacon->cntdwn_counter_offsets; 4995 count = beacon->cntdwn_current_counter; 4996 if (link->conf->csa_active) 4997 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4998 4999 for (i = 0; i < max_count; ++i) { 5000 if (bcn_offsets[i]) { 5001 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5002 return; 5003 beacon_data[bcn_offsets[i]] = count; 5004 } 5005 5006 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5007 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5008 5009 resp->data[resp_offsets[i]] = count; 5010 } 5011 } 5012 } 5013 __ieee80211_beacon_update_cntdwn(struct beacon_data * beacon)5014 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 5015 { 5016 beacon->cntdwn_current_counter--; 5017 5018 /* the counter should never reach 0 */ 5019 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 5020 5021 return beacon->cntdwn_current_counter; 5022 } 5023 ieee80211_beacon_update_cntdwn(struct ieee80211_vif * vif)5024 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 5025 { 5026 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5027 struct beacon_data *beacon = NULL; 5028 u8 count = 0; 5029 5030 rcu_read_lock(); 5031 5032 if (sdata->vif.type == NL80211_IFTYPE_AP) 5033 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5034 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5035 beacon = rcu_dereference(sdata->u.ibss.presp); 5036 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5037 beacon = rcu_dereference(sdata->u.mesh.beacon); 5038 5039 if (!beacon) 5040 goto unlock; 5041 5042 count = __ieee80211_beacon_update_cntdwn(beacon); 5043 5044 unlock: 5045 rcu_read_unlock(); 5046 return count; 5047 } 5048 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5049 ieee80211_beacon_set_cntdwn(struct ieee80211_vif * vif,u8 counter)5050 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5051 { 5052 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5053 struct beacon_data *beacon = NULL; 5054 5055 rcu_read_lock(); 5056 5057 if (sdata->vif.type == NL80211_IFTYPE_AP) 5058 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5059 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5060 beacon = rcu_dereference(sdata->u.ibss.presp); 5061 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5062 beacon = rcu_dereference(sdata->u.mesh.beacon); 5063 5064 if (!beacon) 5065 goto unlock; 5066 5067 if (counter < beacon->cntdwn_current_counter) 5068 beacon->cntdwn_current_counter = counter; 5069 5070 unlock: 5071 rcu_read_unlock(); 5072 } 5073 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5074 ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif * vif)5075 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 5076 { 5077 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5078 struct beacon_data *beacon = NULL; 5079 u8 *beacon_data; 5080 size_t beacon_data_len; 5081 int ret = false; 5082 5083 if (!ieee80211_sdata_running(sdata)) 5084 return false; 5085 5086 rcu_read_lock(); 5087 if (vif->type == NL80211_IFTYPE_AP) { 5088 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5089 if (WARN_ON(!beacon || !beacon->tail)) 5090 goto out; 5091 beacon_data = beacon->tail; 5092 beacon_data_len = beacon->tail_len; 5093 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5094 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5095 5096 beacon = rcu_dereference(ifibss->presp); 5097 if (!beacon) 5098 goto out; 5099 5100 beacon_data = beacon->head; 5101 beacon_data_len = beacon->head_len; 5102 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5103 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5104 5105 beacon = rcu_dereference(ifmsh->beacon); 5106 if (!beacon) 5107 goto out; 5108 5109 beacon_data = beacon->head; 5110 beacon_data_len = beacon->head_len; 5111 } else { 5112 WARN_ON(1); 5113 goto out; 5114 } 5115 5116 if (!beacon->cntdwn_counter_offsets[0]) 5117 goto out; 5118 5119 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5120 goto out; 5121 5122 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5123 ret = true; 5124 5125 out: 5126 rcu_read_unlock(); 5127 5128 return ret; 5129 } 5130 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5131 ieee80211_beacon_protect(struct sk_buff * skb,struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link)5132 static int ieee80211_beacon_protect(struct sk_buff *skb, 5133 struct ieee80211_local *local, 5134 struct ieee80211_sub_if_data *sdata, 5135 struct ieee80211_link_data *link) 5136 { 5137 ieee80211_tx_result res; 5138 struct ieee80211_tx_data tx; 5139 struct sk_buff *check_skb; 5140 5141 memset(&tx, 0, sizeof(tx)); 5142 tx.key = rcu_dereference(link->default_beacon_key); 5143 if (!tx.key) 5144 return 0; 5145 5146 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5147 tx.key = NULL; 5148 return -EINVAL; 5149 } 5150 5151 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5152 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5153 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5154 5155 tx.local = local; 5156 tx.sdata = sdata; 5157 __skb_queue_head_init(&tx.skbs); 5158 __skb_queue_tail(&tx.skbs, skb); 5159 res = ieee80211_tx_h_encrypt(&tx); 5160 check_skb = __skb_dequeue(&tx.skbs); 5161 /* we may crash after this, but it'd be a bug in crypto */ 5162 WARN_ON(check_skb != skb); 5163 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5164 return -EINVAL; 5165 5166 return 0; 5167 } 5168 5169 static void ieee80211_beacon_get_finish(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_link_data * link,struct ieee80211_mutable_offsets * offs,struct beacon_data * beacon,struct sk_buff * skb,struct ieee80211_chanctx_conf * chanctx_conf,u16 csa_off_base)5170 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5171 struct ieee80211_vif *vif, 5172 struct ieee80211_link_data *link, 5173 struct ieee80211_mutable_offsets *offs, 5174 struct beacon_data *beacon, 5175 struct sk_buff *skb, 5176 struct ieee80211_chanctx_conf *chanctx_conf, 5177 u16 csa_off_base) 5178 { 5179 struct ieee80211_local *local = hw_to_local(hw); 5180 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5181 struct ieee80211_tx_info *info; 5182 enum nl80211_band band; 5183 struct ieee80211_tx_rate_control txrc; 5184 5185 /* CSA offsets */ 5186 if (offs && beacon) { 5187 u16 i; 5188 5189 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5190 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5191 5192 if (!csa_off) 5193 continue; 5194 5195 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5196 } 5197 } 5198 5199 band = chanctx_conf->def.chan->band; 5200 info = IEEE80211_SKB_CB(skb); 5201 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5202 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5203 info->band = band; 5204 5205 memset(&txrc, 0, sizeof(txrc)); 5206 txrc.hw = hw; 5207 txrc.sband = local->hw.wiphy->bands[band]; 5208 txrc.bss_conf = link->conf; 5209 txrc.skb = skb; 5210 txrc.reported_rate.idx = -1; 5211 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5212 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5213 else 5214 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5215 txrc.bss = true; 5216 rate_control_get_rate(sdata, NULL, &txrc); 5217 5218 info->control.vif = vif; 5219 info->control.flags |= u32_encode_bits(link->link_id, 5220 IEEE80211_TX_CTRL_MLO_LINK); 5221 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5222 IEEE80211_TX_CTL_ASSIGN_SEQ | 5223 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5224 } 5225 5226 static void ieee80211_beacon_add_mbssid(struct sk_buff * skb,struct beacon_data * beacon,u8 i)5227 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5228 u8 i) 5229 { 5230 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5231 i > beacon->mbssid_ies->cnt) 5232 return; 5233 5234 if (i < beacon->mbssid_ies->cnt) { 5235 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5236 beacon->mbssid_ies->elem[i].len); 5237 5238 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5239 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5240 beacon->rnr_ies->elem[i].len); 5241 5242 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5243 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5244 beacon->rnr_ies->elem[i].len); 5245 } 5246 return; 5247 } 5248 5249 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5250 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5251 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5252 beacon->mbssid_ies->elem[i].len); 5253 } 5254 5255 static struct sk_buff * ieee80211_beacon_get_ap(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_link_data * link,struct ieee80211_mutable_offsets * offs,bool is_template,struct beacon_data * beacon,struct ieee80211_chanctx_conf * chanctx_conf,u8 ema_index)5256 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5257 struct ieee80211_vif *vif, 5258 struct ieee80211_link_data *link, 5259 struct ieee80211_mutable_offsets *offs, 5260 bool is_template, 5261 struct beacon_data *beacon, 5262 struct ieee80211_chanctx_conf *chanctx_conf, 5263 u8 ema_index) 5264 { 5265 struct ieee80211_local *local = hw_to_local(hw); 5266 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5267 struct ieee80211_if_ap *ap = &sdata->u.ap; 5268 struct sk_buff *skb = NULL; 5269 u16 csa_off_base = 0; 5270 int mbssid_len; 5271 5272 if (beacon->cntdwn_counter_offsets[0]) { 5273 if (!is_template) 5274 ieee80211_beacon_update_cntdwn(vif); 5275 5276 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5277 } 5278 5279 /* headroom, head length, 5280 * tail length, maximum TIM length and multiple BSSID length 5281 */ 5282 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5283 beacon->rnr_ies, 5284 ema_index); 5285 5286 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5287 beacon->tail_len + 256 + 5288 local->hw.extra_beacon_tailroom + mbssid_len); 5289 if (!skb) 5290 return NULL; 5291 5292 skb_reserve(skb, local->tx_headroom); 5293 skb_put_data(skb, beacon->head, beacon->head_len); 5294 5295 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5296 5297 if (offs) { 5298 offs->tim_offset = beacon->head_len; 5299 offs->tim_length = skb->len - beacon->head_len; 5300 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5301 5302 if (mbssid_len) { 5303 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5304 offs->mbssid_off = skb->len - mbssid_len; 5305 } 5306 5307 /* for AP the csa offsets are from tail */ 5308 csa_off_base = skb->len; 5309 } 5310 5311 if (beacon->tail) 5312 skb_put_data(skb, beacon->tail, beacon->tail_len); 5313 5314 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5315 dev_kfree_skb(skb); 5316 return NULL; 5317 } 5318 5319 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5320 chanctx_conf, csa_off_base); 5321 return skb; 5322 } 5323 5324 static struct ieee80211_ema_beacons * ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_link_data * link,struct ieee80211_mutable_offsets * offs,bool is_template,struct beacon_data * beacon,struct ieee80211_chanctx_conf * chanctx_conf)5325 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5326 struct ieee80211_vif *vif, 5327 struct ieee80211_link_data *link, 5328 struct ieee80211_mutable_offsets *offs, 5329 bool is_template, struct beacon_data *beacon, 5330 struct ieee80211_chanctx_conf *chanctx_conf) 5331 { 5332 struct ieee80211_ema_beacons *ema = NULL; 5333 5334 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5335 return NULL; 5336 5337 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5338 GFP_ATOMIC); 5339 if (!ema) 5340 return NULL; 5341 5342 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5343 ema->bcn[ema->cnt].skb = 5344 ieee80211_beacon_get_ap(hw, vif, link, 5345 &ema->bcn[ema->cnt].offs, 5346 is_template, beacon, 5347 chanctx_conf, ema->cnt); 5348 if (!ema->bcn[ema->cnt].skb) 5349 break; 5350 } 5351 5352 if (ema->cnt == beacon->mbssid_ies->cnt) 5353 return ema; 5354 5355 ieee80211_beacon_free_ema_list(ema); 5356 return NULL; 5357 } 5358 5359 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5360 5361 static struct sk_buff * __ieee80211_beacon_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,bool is_template,unsigned int link_id,int ema_index,struct ieee80211_ema_beacons ** ema_beacons)5362 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5363 struct ieee80211_vif *vif, 5364 struct ieee80211_mutable_offsets *offs, 5365 bool is_template, 5366 unsigned int link_id, 5367 int ema_index, 5368 struct ieee80211_ema_beacons **ema_beacons) 5369 { 5370 struct ieee80211_local *local = hw_to_local(hw); 5371 struct beacon_data *beacon = NULL; 5372 struct sk_buff *skb = NULL; 5373 struct ieee80211_sub_if_data *sdata = NULL; 5374 struct ieee80211_chanctx_conf *chanctx_conf; 5375 struct ieee80211_link_data *link; 5376 5377 rcu_read_lock(); 5378 5379 sdata = vif_to_sdata(vif); 5380 link = rcu_dereference(sdata->link[link_id]); 5381 if (!link) 5382 goto out; 5383 chanctx_conf = 5384 rcu_dereference(link->conf->chanctx_conf); 5385 5386 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5387 goto out; 5388 5389 if (offs) 5390 memset(offs, 0, sizeof(*offs)); 5391 5392 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5393 beacon = rcu_dereference(link->u.ap.beacon); 5394 if (!beacon) 5395 goto out; 5396 5397 if (ema_beacons) { 5398 *ema_beacons = 5399 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5400 offs, 5401 is_template, 5402 beacon, 5403 chanctx_conf); 5404 } else { 5405 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5406 if (ema_index >= beacon->mbssid_ies->cnt) 5407 goto out; /* End of MBSSID elements */ 5408 5409 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5410 ema_index = beacon->mbssid_ies->cnt; 5411 } else { 5412 ema_index = 0; 5413 } 5414 5415 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5416 is_template, beacon, 5417 chanctx_conf, 5418 ema_index); 5419 } 5420 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5421 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5422 struct ieee80211_hdr *hdr; 5423 5424 beacon = rcu_dereference(ifibss->presp); 5425 if (!beacon) 5426 goto out; 5427 5428 if (beacon->cntdwn_counter_offsets[0]) { 5429 if (!is_template) 5430 __ieee80211_beacon_update_cntdwn(beacon); 5431 5432 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5433 } 5434 5435 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5436 local->hw.extra_beacon_tailroom); 5437 if (!skb) 5438 goto out; 5439 skb_reserve(skb, local->tx_headroom); 5440 skb_put_data(skb, beacon->head, beacon->head_len); 5441 5442 hdr = (struct ieee80211_hdr *) skb->data; 5443 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5444 IEEE80211_STYPE_BEACON); 5445 5446 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5447 chanctx_conf, 0); 5448 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5449 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5450 5451 beacon = rcu_dereference(ifmsh->beacon); 5452 if (!beacon) 5453 goto out; 5454 5455 if (beacon->cntdwn_counter_offsets[0]) { 5456 if (!is_template) 5457 /* TODO: For mesh csa_counter is in TU, so 5458 * decrementing it by one isn't correct, but 5459 * for now we leave it consistent with overall 5460 * mac80211's behavior. 5461 */ 5462 __ieee80211_beacon_update_cntdwn(beacon); 5463 5464 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5465 } 5466 5467 if (ifmsh->sync_ops) 5468 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5469 5470 skb = dev_alloc_skb(local->tx_headroom + 5471 beacon->head_len + 5472 256 + /* TIM IE */ 5473 beacon->tail_len + 5474 local->hw.extra_beacon_tailroom); 5475 if (!skb) 5476 goto out; 5477 skb_reserve(skb, local->tx_headroom); 5478 skb_put_data(skb, beacon->head, beacon->head_len); 5479 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5480 is_template); 5481 5482 if (offs) { 5483 offs->tim_offset = beacon->head_len; 5484 offs->tim_length = skb->len - beacon->head_len; 5485 } 5486 5487 skb_put_data(skb, beacon->tail, beacon->tail_len); 5488 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5489 chanctx_conf, 0); 5490 } else { 5491 WARN_ON(1); 5492 goto out; 5493 } 5494 5495 out: 5496 rcu_read_unlock(); 5497 return skb; 5498 5499 } 5500 5501 struct sk_buff * ieee80211_beacon_get_template(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,unsigned int link_id)5502 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5503 struct ieee80211_vif *vif, 5504 struct ieee80211_mutable_offsets *offs, 5505 unsigned int link_id) 5506 { 5507 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5508 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5509 } 5510 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5511 5512 struct sk_buff * ieee80211_beacon_get_template_ema_index(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,unsigned int link_id,u8 ema_index)5513 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5514 struct ieee80211_vif *vif, 5515 struct ieee80211_mutable_offsets *offs, 5516 unsigned int link_id, u8 ema_index) 5517 { 5518 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5519 NULL); 5520 } 5521 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5522 ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons * ema_beacons)5523 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5524 { 5525 u8 i; 5526 5527 if (!ema_beacons) 5528 return; 5529 5530 for (i = 0; i < ema_beacons->cnt; i++) 5531 kfree_skb(ema_beacons->bcn[i].skb); 5532 5533 kfree(ema_beacons); 5534 } 5535 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5536 5537 struct ieee80211_ema_beacons * ieee80211_beacon_get_template_ema_list(struct ieee80211_hw * hw,struct ieee80211_vif * vif,unsigned int link_id)5538 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5539 struct ieee80211_vif *vif, 5540 unsigned int link_id) 5541 { 5542 struct ieee80211_ema_beacons *ema_beacons = NULL; 5543 5544 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5545 &ema_beacons)); 5546 5547 return ema_beacons; 5548 } 5549 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5550 ieee80211_beacon_get_tim(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u16 * tim_offset,u16 * tim_length,unsigned int link_id)5551 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5552 struct ieee80211_vif *vif, 5553 u16 *tim_offset, u16 *tim_length, 5554 unsigned int link_id) 5555 { 5556 struct ieee80211_mutable_offsets offs = {}; 5557 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5558 link_id, 5559 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5560 NULL); 5561 struct sk_buff *copy; 5562 int shift; 5563 5564 if (!bcn) 5565 return bcn; 5566 5567 if (tim_offset) 5568 *tim_offset = offs.tim_offset; 5569 5570 if (tim_length) 5571 *tim_length = offs.tim_length; 5572 5573 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5574 !hw_to_local(hw)->monitors) 5575 return bcn; 5576 5577 /* send a copy to monitor interfaces */ 5578 copy = skb_copy(bcn, GFP_ATOMIC); 5579 if (!copy) 5580 return bcn; 5581 5582 shift = ieee80211_vif_get_shift(vif); 5583 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5584 5585 return bcn; 5586 } 5587 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5588 ieee80211_proberesp_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5589 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5590 struct ieee80211_vif *vif) 5591 { 5592 struct sk_buff *skb = NULL; 5593 struct probe_resp *presp = NULL; 5594 struct ieee80211_hdr *hdr; 5595 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5596 5597 if (sdata->vif.type != NL80211_IFTYPE_AP) 5598 return NULL; 5599 5600 rcu_read_lock(); 5601 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5602 if (!presp) 5603 goto out; 5604 5605 skb = dev_alloc_skb(presp->len); 5606 if (!skb) 5607 goto out; 5608 5609 skb_put_data(skb, presp->data, presp->len); 5610 5611 hdr = (struct ieee80211_hdr *) skb->data; 5612 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5613 5614 out: 5615 rcu_read_unlock(); 5616 return skb; 5617 } 5618 EXPORT_SYMBOL(ieee80211_proberesp_get); 5619 ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5620 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5621 struct ieee80211_vif *vif) 5622 { 5623 struct sk_buff *skb = NULL; 5624 struct fils_discovery_data *tmpl = NULL; 5625 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5626 5627 if (sdata->vif.type != NL80211_IFTYPE_AP) 5628 return NULL; 5629 5630 rcu_read_lock(); 5631 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5632 if (!tmpl) { 5633 rcu_read_unlock(); 5634 return NULL; 5635 } 5636 5637 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5638 if (skb) { 5639 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5640 skb_put_data(skb, tmpl->data, tmpl->len); 5641 } 5642 5643 rcu_read_unlock(); 5644 return skb; 5645 } 5646 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5647 5648 struct sk_buff * ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5649 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5650 struct ieee80211_vif *vif) 5651 { 5652 struct sk_buff *skb = NULL; 5653 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5654 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5655 5656 if (sdata->vif.type != NL80211_IFTYPE_AP) 5657 return NULL; 5658 5659 rcu_read_lock(); 5660 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5661 if (!tmpl) { 5662 rcu_read_unlock(); 5663 return NULL; 5664 } 5665 5666 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5667 if (skb) { 5668 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5669 skb_put_data(skb, tmpl->data, tmpl->len); 5670 } 5671 5672 rcu_read_unlock(); 5673 return skb; 5674 } 5675 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5676 ieee80211_pspoll_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5677 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5678 struct ieee80211_vif *vif) 5679 { 5680 struct ieee80211_sub_if_data *sdata; 5681 struct ieee80211_pspoll *pspoll; 5682 struct ieee80211_local *local; 5683 struct sk_buff *skb; 5684 5685 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5686 return NULL; 5687 5688 sdata = vif_to_sdata(vif); 5689 local = sdata->local; 5690 5691 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5692 if (!skb) 5693 return NULL; 5694 5695 skb_reserve(skb, local->hw.extra_tx_headroom); 5696 5697 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5698 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5699 IEEE80211_STYPE_PSPOLL); 5700 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5701 5702 /* aid in PS-Poll has its two MSBs each set to 1 */ 5703 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5704 5705 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5706 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5707 5708 return skb; 5709 } 5710 EXPORT_SYMBOL(ieee80211_pspoll_get); 5711 ieee80211_nullfunc_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,int link_id,bool qos_ok)5712 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5713 struct ieee80211_vif *vif, 5714 int link_id, bool qos_ok) 5715 { 5716 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5717 struct ieee80211_local *local = sdata->local; 5718 struct ieee80211_link_data *link = NULL; 5719 struct ieee80211_hdr_3addr *nullfunc; 5720 struct sk_buff *skb; 5721 bool qos = false; 5722 5723 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5724 return NULL; 5725 5726 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5727 sizeof(*nullfunc) + 2); 5728 if (!skb) 5729 return NULL; 5730 5731 rcu_read_lock(); 5732 if (qos_ok) { 5733 struct sta_info *sta; 5734 5735 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5736 qos = sta && sta->sta.wme; 5737 } 5738 5739 if (link_id >= 0) { 5740 link = rcu_dereference(sdata->link[link_id]); 5741 if (WARN_ON_ONCE(!link)) { 5742 rcu_read_unlock(); 5743 kfree_skb(skb); 5744 return NULL; 5745 } 5746 } 5747 5748 skb_reserve(skb, local->hw.extra_tx_headroom); 5749 5750 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5751 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5752 IEEE80211_STYPE_NULLFUNC | 5753 IEEE80211_FCTL_TODS); 5754 if (qos) { 5755 __le16 qoshdr = cpu_to_le16(7); 5756 5757 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5758 IEEE80211_STYPE_NULLFUNC) != 5759 IEEE80211_STYPE_QOS_NULLFUNC); 5760 nullfunc->frame_control |= 5761 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5762 skb->priority = 7; 5763 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5764 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5765 } 5766 5767 if (link) { 5768 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5769 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5770 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5771 } else { 5772 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5773 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5774 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5775 } 5776 rcu_read_unlock(); 5777 5778 return skb; 5779 } 5780 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5781 ieee80211_probereq_get(struct ieee80211_hw * hw,const u8 * src_addr,const u8 * ssid,size_t ssid_len,size_t tailroom)5782 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5783 const u8 *src_addr, 5784 const u8 *ssid, size_t ssid_len, 5785 size_t tailroom) 5786 { 5787 struct ieee80211_local *local = hw_to_local(hw); 5788 struct ieee80211_hdr_3addr *hdr; 5789 struct sk_buff *skb; 5790 size_t ie_ssid_len; 5791 u8 *pos; 5792 5793 ie_ssid_len = 2 + ssid_len; 5794 5795 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5796 ie_ssid_len + tailroom); 5797 if (!skb) 5798 return NULL; 5799 5800 skb_reserve(skb, local->hw.extra_tx_headroom); 5801 5802 hdr = skb_put_zero(skb, sizeof(*hdr)); 5803 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5804 IEEE80211_STYPE_PROBE_REQ); 5805 eth_broadcast_addr(hdr->addr1); 5806 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5807 eth_broadcast_addr(hdr->addr3); 5808 5809 pos = skb_put(skb, ie_ssid_len); 5810 *pos++ = WLAN_EID_SSID; 5811 *pos++ = ssid_len; 5812 if (ssid_len) 5813 memcpy(pos, ssid, ssid_len); 5814 pos += ssid_len; 5815 5816 return skb; 5817 } 5818 EXPORT_SYMBOL(ieee80211_probereq_get); 5819 ieee80211_rts_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const void * frame,size_t frame_len,const struct ieee80211_tx_info * frame_txctl,struct ieee80211_rts * rts)5820 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5821 const void *frame, size_t frame_len, 5822 const struct ieee80211_tx_info *frame_txctl, 5823 struct ieee80211_rts *rts) 5824 { 5825 const struct ieee80211_hdr *hdr = frame; 5826 5827 rts->frame_control = 5828 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5829 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5830 frame_txctl); 5831 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5832 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5833 } 5834 EXPORT_SYMBOL(ieee80211_rts_get); 5835 ieee80211_ctstoself_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const void * frame,size_t frame_len,const struct ieee80211_tx_info * frame_txctl,struct ieee80211_cts * cts)5836 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5837 const void *frame, size_t frame_len, 5838 const struct ieee80211_tx_info *frame_txctl, 5839 struct ieee80211_cts *cts) 5840 { 5841 const struct ieee80211_hdr *hdr = frame; 5842 5843 cts->frame_control = 5844 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5845 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5846 frame_len, frame_txctl); 5847 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5848 } 5849 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5850 5851 struct sk_buff * ieee80211_get_buffered_bc(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5852 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5853 struct ieee80211_vif *vif) 5854 { 5855 struct ieee80211_local *local = hw_to_local(hw); 5856 struct sk_buff *skb = NULL; 5857 struct ieee80211_tx_data tx; 5858 struct ieee80211_sub_if_data *sdata; 5859 struct ps_data *ps; 5860 struct ieee80211_tx_info *info; 5861 struct ieee80211_chanctx_conf *chanctx_conf; 5862 5863 sdata = vif_to_sdata(vif); 5864 5865 rcu_read_lock(); 5866 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5867 5868 if (!chanctx_conf) 5869 goto out; 5870 5871 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5872 struct beacon_data *beacon = 5873 rcu_dereference(sdata->deflink.u.ap.beacon); 5874 5875 if (!beacon || !beacon->head) 5876 goto out; 5877 5878 ps = &sdata->u.ap.ps; 5879 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5880 ps = &sdata->u.mesh.ps; 5881 } else { 5882 goto out; 5883 } 5884 5885 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5886 goto out; /* send buffered bc/mc only after DTIM beacon */ 5887 5888 while (1) { 5889 skb = skb_dequeue(&ps->bc_buf); 5890 if (!skb) 5891 goto out; 5892 local->total_ps_buffered--; 5893 5894 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5895 struct ieee80211_hdr *hdr = 5896 (struct ieee80211_hdr *) skb->data; 5897 /* more buffered multicast/broadcast frames ==> set 5898 * MoreData flag in IEEE 802.11 header to inform PS 5899 * STAs */ 5900 hdr->frame_control |= 5901 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5902 } 5903 5904 if (sdata->vif.type == NL80211_IFTYPE_AP) 5905 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5906 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5907 break; 5908 ieee80211_free_txskb(hw, skb); 5909 } 5910 5911 info = IEEE80211_SKB_CB(skb); 5912 5913 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5914 info->band = chanctx_conf->def.chan->band; 5915 5916 if (invoke_tx_handlers(&tx)) 5917 skb = NULL; 5918 out: 5919 rcu_read_unlock(); 5920 5921 return skb; 5922 } 5923 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5924 ieee80211_reserve_tid(struct ieee80211_sta * pubsta,u8 tid)5925 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5926 { 5927 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5928 struct ieee80211_sub_if_data *sdata = sta->sdata; 5929 struct ieee80211_local *local = sdata->local; 5930 int ret; 5931 u32 queues; 5932 5933 lockdep_assert_held(&local->sta_mtx); 5934 5935 /* only some cases are supported right now */ 5936 switch (sdata->vif.type) { 5937 case NL80211_IFTYPE_STATION: 5938 case NL80211_IFTYPE_AP: 5939 case NL80211_IFTYPE_AP_VLAN: 5940 break; 5941 default: 5942 WARN_ON(1); 5943 return -EINVAL; 5944 } 5945 5946 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5947 return -EINVAL; 5948 5949 if (sta->reserved_tid == tid) { 5950 ret = 0; 5951 goto out; 5952 } 5953 5954 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5955 sdata_err(sdata, "TID reservation already active\n"); 5956 ret = -EALREADY; 5957 goto out; 5958 } 5959 5960 ieee80211_stop_vif_queues(sdata->local, sdata, 5961 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5962 5963 synchronize_net(); 5964 5965 /* Tear down BA sessions so we stop aggregating on this TID */ 5966 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5967 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5968 __ieee80211_stop_tx_ba_session(sta, tid, 5969 AGG_STOP_LOCAL_REQUEST); 5970 } 5971 5972 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5973 __ieee80211_flush_queues(local, sdata, queues, false); 5974 5975 sta->reserved_tid = tid; 5976 5977 ieee80211_wake_vif_queues(local, sdata, 5978 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5979 5980 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5981 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5982 5983 ret = 0; 5984 out: 5985 return ret; 5986 } 5987 EXPORT_SYMBOL(ieee80211_reserve_tid); 5988 ieee80211_unreserve_tid(struct ieee80211_sta * pubsta,u8 tid)5989 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5990 { 5991 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5992 struct ieee80211_sub_if_data *sdata = sta->sdata; 5993 5994 lockdep_assert_held(&sdata->local->sta_mtx); 5995 5996 /* only some cases are supported right now */ 5997 switch (sdata->vif.type) { 5998 case NL80211_IFTYPE_STATION: 5999 case NL80211_IFTYPE_AP: 6000 case NL80211_IFTYPE_AP_VLAN: 6001 break; 6002 default: 6003 WARN_ON(1); 6004 return; 6005 } 6006 6007 if (tid != sta->reserved_tid) { 6008 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6009 return; 6010 } 6011 6012 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6013 } 6014 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6015 __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int tid,int link_id,enum nl80211_band band)6016 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6017 struct sk_buff *skb, int tid, int link_id, 6018 enum nl80211_band band) 6019 { 6020 const struct ieee80211_hdr *hdr = (void *)skb->data; 6021 int ac = ieee80211_ac_from_tid(tid); 6022 unsigned int link; 6023 6024 skb_reset_mac_header(skb); 6025 skb_set_queue_mapping(skb, ac); 6026 skb->priority = tid; 6027 6028 skb->dev = sdata->dev; 6029 6030 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6031 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6032 IEEE80211_LINK_UNSPECIFIED)); 6033 6034 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6035 link = 0; 6036 } else if (link_id >= 0) { 6037 link = link_id; 6038 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6039 /* address from the MLD */ 6040 link = IEEE80211_LINK_UNSPECIFIED; 6041 } else { 6042 /* otherwise must be addressed from a link */ 6043 rcu_read_lock(); 6044 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6045 struct ieee80211_bss_conf *link_conf; 6046 6047 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6048 if (!link_conf) 6049 continue; 6050 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6051 break; 6052 } 6053 rcu_read_unlock(); 6054 6055 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6056 link = ffs(sdata->vif.active_links) - 1; 6057 } 6058 6059 IEEE80211_SKB_CB(skb)->control.flags |= 6060 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6061 6062 /* 6063 * The other path calling ieee80211_xmit is from the tasklet, 6064 * and while we can handle concurrent transmissions locking 6065 * requirements are that we do not come into tx with bhs on. 6066 */ 6067 local_bh_disable(); 6068 IEEE80211_SKB_CB(skb)->band = band; 6069 ieee80211_xmit(sdata, NULL, skb); 6070 local_bh_enable(); 6071 } 6072 ieee80211_tx_skb_tid(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int tid,int link_id)6073 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6074 struct sk_buff *skb, int tid, int link_id) 6075 { 6076 struct ieee80211_chanctx_conf *chanctx_conf; 6077 enum nl80211_band band; 6078 6079 rcu_read_lock(); 6080 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6081 WARN_ON(link_id >= 0); 6082 chanctx_conf = 6083 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6084 if (WARN_ON(!chanctx_conf)) { 6085 rcu_read_unlock(); 6086 kfree_skb(skb); 6087 return; 6088 } 6089 band = chanctx_conf->def.chan->band; 6090 } else { 6091 WARN_ON(link_id >= 0 && 6092 !(sdata->vif.active_links & BIT(link_id))); 6093 /* MLD transmissions must not rely on the band */ 6094 band = 0; 6095 } 6096 6097 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6098 rcu_read_unlock(); 6099 } 6100 ieee80211_tx_control_port(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len,const u8 * dest,__be16 proto,bool unencrypted,int link_id,u64 * cookie)6101 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6102 const u8 *buf, size_t len, 6103 const u8 *dest, __be16 proto, bool unencrypted, 6104 int link_id, u64 *cookie) 6105 { 6106 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6107 struct ieee80211_local *local = sdata->local; 6108 struct sta_info *sta; 6109 struct sk_buff *skb; 6110 struct ethhdr *ehdr; 6111 u32 ctrl_flags = 0; 6112 u32 flags = 0; 6113 int err; 6114 6115 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6116 * or Pre-Authentication 6117 */ 6118 if (proto != sdata->control_port_protocol && 6119 proto != cpu_to_be16(ETH_P_PREAUTH)) 6120 return -EINVAL; 6121 6122 if (proto == sdata->control_port_protocol) 6123 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6124 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6125 6126 if (unencrypted) 6127 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6128 6129 if (cookie) 6130 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6131 6132 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6133 6134 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6135 sizeof(struct ethhdr) + len); 6136 if (!skb) 6137 return -ENOMEM; 6138 6139 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6140 6141 skb_put_data(skb, buf, len); 6142 6143 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6144 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6145 6146 /* we may override the SA for MLO STA later */ 6147 if (link_id < 0) { 6148 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6149 IEEE80211_TX_CTRL_MLO_LINK); 6150 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6151 } else { 6152 struct ieee80211_bss_conf *link_conf; 6153 6154 ctrl_flags |= u32_encode_bits(link_id, 6155 IEEE80211_TX_CTRL_MLO_LINK); 6156 6157 rcu_read_lock(); 6158 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6159 if (!link_conf) { 6160 dev_kfree_skb(skb); 6161 rcu_read_unlock(); 6162 return -ENOLINK; 6163 } 6164 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6165 rcu_read_unlock(); 6166 } 6167 6168 ehdr->h_proto = proto; 6169 6170 skb->dev = dev; 6171 skb->protocol = proto; 6172 skb_reset_network_header(skb); 6173 skb_reset_mac_header(skb); 6174 6175 if (local->hw.queues < IEEE80211_NUM_ACS) 6176 goto start_xmit; 6177 6178 /* update QoS header to prioritize control port frames if possible, 6179 * priorization also happens for control port frames send over 6180 * AF_PACKET 6181 */ 6182 rcu_read_lock(); 6183 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6184 if (err) { 6185 dev_kfree_skb(skb); 6186 rcu_read_unlock(); 6187 return err; 6188 } 6189 6190 if (!IS_ERR(sta)) { 6191 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6192 6193 skb_set_queue_mapping(skb, queue); 6194 6195 /* 6196 * for MLO STA, the SA should be the AP MLD address, but 6197 * the link ID has been selected already 6198 */ 6199 if (sta && sta->sta.mlo) 6200 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6201 } 6202 rcu_read_unlock(); 6203 6204 start_xmit: 6205 /* mutex lock is only needed for incrementing the cookie counter */ 6206 mutex_lock(&local->mtx); 6207 6208 local_bh_disable(); 6209 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6210 local_bh_enable(); 6211 6212 mutex_unlock(&local->mtx); 6213 6214 return 0; 6215 } 6216 ieee80211_probe_mesh_link(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len)6217 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6218 const u8 *buf, size_t len) 6219 { 6220 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6221 struct ieee80211_local *local = sdata->local; 6222 struct sk_buff *skb; 6223 6224 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6225 30 + /* header size */ 6226 18); /* 11s header size */ 6227 if (!skb) 6228 return -ENOMEM; 6229 6230 skb_reserve(skb, local->hw.extra_tx_headroom); 6231 skb_put_data(skb, buf, len); 6232 6233 skb->dev = dev; 6234 skb->protocol = htons(ETH_P_802_3); 6235 skb_reset_network_header(skb); 6236 skb_reset_mac_header(skb); 6237 6238 local_bh_disable(); 6239 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6240 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6241 NULL); 6242 local_bh_enable(); 6243 6244 return 0; 6245 } 6246