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) 2018-2021 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 <linux/timekeeping.h> 22 #include <net/net_namespace.h> 23 #include <net/ieee80211_radiotap.h> 24 #include <net/cfg80211.h> 25 #include <net/mac80211.h> 26 #include <net/codel.h> 27 #include <net/codel_impl.h> 28 #include <asm/unaligned.h> 29 #include <net/fq_impl.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.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 u32 flag; 151 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 152 flag = IEEE80211_RATE_MANDATORY_G; 153 else 154 flag = IEEE80211_RATE_MANDATORY_B; 155 if (r->flags & flag) 156 mrate = r->bitrate; 157 break; 158 } 159 case NL80211_BAND_5GHZ: 160 case NL80211_BAND_6GHZ: 161 if (r->flags & IEEE80211_RATE_MANDATORY_A) 162 mrate = r->bitrate; 163 break; 164 case NL80211_BAND_S1GHZ: 165 case NL80211_BAND_60GHZ: 166 /* TODO, for now fall through */ 167 case NUM_NL80211_BANDS: 168 WARN_ON(1); 169 break; 170 } 171 } 172 if (rate == -1) { 173 /* No matching basic rate found; use highest suitable mandatory 174 * PHY rate */ 175 rate = DIV_ROUND_UP(mrate, 1 << shift); 176 } 177 178 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 179 if (ieee80211_is_data_qos(hdr->frame_control) && 180 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 181 dur = 0; 182 else 183 /* Time needed to transmit ACK 184 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 185 * to closest integer */ 186 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 187 tx->sdata->vif.bss_conf.use_short_preamble, 188 shift); 189 190 if (next_frag_len) { 191 /* Frame is fragmented: duration increases with time needed to 192 * transmit next fragment plus ACK and 2 x SIFS. */ 193 dur *= 2; /* ACK + SIFS */ 194 /* next fragment */ 195 dur += ieee80211_frame_duration(sband->band, next_frag_len, 196 txrate->bitrate, erp, 197 tx->sdata->vif.bss_conf.use_short_preamble, 198 shift); 199 } 200 201 return cpu_to_le16(dur); 202 } 203 204 /* tx handlers */ 205 static ieee80211_tx_result debug_noinline ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data * tx)206 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 207 { 208 struct ieee80211_local *local = tx->local; 209 struct ieee80211_if_managed *ifmgd; 210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 211 212 /* driver doesn't support power save */ 213 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 214 return TX_CONTINUE; 215 216 /* hardware does dynamic power save */ 217 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 218 return TX_CONTINUE; 219 220 /* dynamic power save disabled */ 221 if (local->hw.conf.dynamic_ps_timeout <= 0) 222 return TX_CONTINUE; 223 224 /* we are scanning, don't enable power save */ 225 if (local->scanning) 226 return TX_CONTINUE; 227 228 if (!local->ps_sdata) 229 return TX_CONTINUE; 230 231 /* No point if we're going to suspend */ 232 if (local->quiescing) 233 return TX_CONTINUE; 234 235 /* dynamic ps is supported only in managed mode */ 236 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 237 return TX_CONTINUE; 238 239 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 240 return TX_CONTINUE; 241 242 ifmgd = &tx->sdata->u.mgd; 243 244 /* 245 * Don't wakeup from power save if u-apsd is enabled, voip ac has 246 * u-apsd enabled and the frame is in voip class. This effectively 247 * means that even if all access categories have u-apsd enabled, in 248 * practise u-apsd is only used with the voip ac. This is a 249 * workaround for the case when received voip class packets do not 250 * have correct qos tag for some reason, due the network or the 251 * peer application. 252 * 253 * Note: ifmgd->uapsd_queues access is racy here. If the value is 254 * changed via debugfs, user needs to reassociate manually to have 255 * everything in sync. 256 */ 257 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 258 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 259 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 260 return TX_CONTINUE; 261 262 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 263 ieee80211_stop_queues_by_reason(&local->hw, 264 IEEE80211_MAX_QUEUE_MAP, 265 IEEE80211_QUEUE_STOP_REASON_PS, 266 false); 267 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 268 ieee80211_queue_work(&local->hw, 269 &local->dynamic_ps_disable_work); 270 } 271 272 /* Don't restart the timer if we're not disassociated */ 273 if (!ifmgd->associated) 274 return TX_CONTINUE; 275 276 mod_timer(&local->dynamic_ps_timer, jiffies + 277 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 278 279 return TX_CONTINUE; 280 } 281 282 static ieee80211_tx_result debug_noinline ieee80211_tx_h_check_assoc(struct ieee80211_tx_data * tx)283 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 284 { 285 286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 287 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 288 bool assoc = false; 289 290 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 291 return TX_CONTINUE; 292 293 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 294 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 295 !ieee80211_is_probe_req(hdr->frame_control) && 296 !ieee80211_is_any_nullfunc(hdr->frame_control)) 297 /* 298 * When software scanning only nullfunc frames (to notify 299 * the sleep state to the AP) and probe requests (for the 300 * active scan) are allowed, all other frames should not be 301 * sent and we should not get here, but if we do 302 * nonetheless, drop them to avoid sending them 303 * off-channel. See the link below and 304 * ieee80211_start_scan() for more. 305 * 306 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 307 */ 308 return TX_DROP; 309 310 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 311 return TX_CONTINUE; 312 313 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 314 return TX_CONTINUE; 315 316 if (tx->sta) 317 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 318 319 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 320 if (unlikely(!assoc && 321 ieee80211_is_data(hdr->frame_control))) { 322 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 323 sdata_info(tx->sdata, 324 "dropped data frame to not associated station %pM\n", 325 hdr->addr1); 326 #endif 327 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 328 return TX_DROP; 329 } 330 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 331 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 332 /* 333 * No associated STAs - no need to send multicast 334 * frames. 335 */ 336 return TX_DROP; 337 } 338 339 return TX_CONTINUE; 340 } 341 342 /* This function is called whenever the AP is about to exceed the maximum limit 343 * of buffered frames for power saving STAs. This situation should not really 344 * happen often during normal operation, so dropping the oldest buffered packet 345 * from each queue should be OK to make some room for new frames. */ purge_old_ps_buffers(struct ieee80211_local * local)346 static void purge_old_ps_buffers(struct ieee80211_local *local) 347 { 348 int total = 0, purged = 0; 349 struct sk_buff *skb; 350 struct ieee80211_sub_if_data *sdata; 351 struct sta_info *sta; 352 353 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 354 struct ps_data *ps; 355 356 if (sdata->vif.type == NL80211_IFTYPE_AP) 357 ps = &sdata->u.ap.ps; 358 else if (ieee80211_vif_is_mesh(&sdata->vif)) 359 ps = &sdata->u.mesh.ps; 360 else 361 continue; 362 363 skb = skb_dequeue(&ps->bc_buf); 364 if (skb) { 365 purged++; 366 ieee80211_free_txskb(&local->hw, skb); 367 } 368 total += skb_queue_len(&ps->bc_buf); 369 } 370 371 /* 372 * Drop one frame from each station from the lowest-priority 373 * AC that has frames at all. 374 */ 375 list_for_each_entry_rcu(sta, &local->sta_list, list) { 376 int ac; 377 378 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 379 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 380 total += skb_queue_len(&sta->ps_tx_buf[ac]); 381 if (skb) { 382 purged++; 383 ieee80211_free_txskb(&local->hw, skb); 384 break; 385 } 386 } 387 } 388 389 local->total_ps_buffered = total; 390 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 391 } 392 393 static ieee80211_tx_result ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data * tx)394 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 395 { 396 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 398 struct ps_data *ps; 399 400 /* 401 * broadcast/multicast frame 402 * 403 * If any of the associated/peer stations is in power save mode, 404 * the frame is buffered to be sent after DTIM beacon frame. 405 * This is done either by the hardware or us. 406 */ 407 408 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 409 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 410 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 411 if (!tx->sdata->bss) 412 return TX_CONTINUE; 413 414 ps = &tx->sdata->bss->ps; 415 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 416 ps = &tx->sdata->u.mesh.ps; 417 } else { 418 return TX_CONTINUE; 419 } 420 421 422 /* no buffering for ordered frames */ 423 if (ieee80211_has_order(hdr->frame_control)) 424 return TX_CONTINUE; 425 426 if (ieee80211_is_probe_req(hdr->frame_control)) 427 return TX_CONTINUE; 428 429 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 430 info->hw_queue = tx->sdata->vif.cab_queue; 431 432 /* no stations in PS mode and no buffered packets */ 433 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 434 return TX_CONTINUE; 435 436 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 437 438 /* device releases frame after DTIM beacon */ 439 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 440 return TX_CONTINUE; 441 442 /* buffered in mac80211 */ 443 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 444 purge_old_ps_buffers(tx->local); 445 446 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 447 ps_dbg(tx->sdata, 448 "BC TX buffer full - dropping the oldest frame\n"); 449 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 450 } else 451 tx->local->total_ps_buffered++; 452 453 skb_queue_tail(&ps->bc_buf, tx->skb); 454 455 return TX_QUEUED; 456 } 457 ieee80211_use_mfp(__le16 fc,struct sta_info * sta,struct sk_buff * skb)458 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 459 struct sk_buff *skb) 460 { 461 if (!ieee80211_is_mgmt(fc)) 462 return 0; 463 464 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 465 return 0; 466 467 if (!ieee80211_is_robust_mgmt_frame(skb)) 468 return 0; 469 470 return 1; 471 } 472 473 static ieee80211_tx_result ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data * tx)474 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 475 { 476 struct sta_info *sta = tx->sta; 477 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 479 struct ieee80211_local *local = tx->local; 480 481 if (unlikely(!sta)) 482 return TX_CONTINUE; 483 484 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 485 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 486 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 487 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 488 int ac = skb_get_queue_mapping(tx->skb); 489 490 if (ieee80211_is_mgmt(hdr->frame_control) && 491 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 492 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 493 return TX_CONTINUE; 494 } 495 496 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 497 sta->sta.addr, sta->sta.aid, ac); 498 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 499 purge_old_ps_buffers(tx->local); 500 501 /* sync with ieee80211_sta_ps_deliver_wakeup */ 502 spin_lock(&sta->ps_lock); 503 /* 504 * STA woke up the meantime and all the frames on ps_tx_buf have 505 * been queued to pending queue. No reordering can happen, go 506 * ahead and Tx the packet. 507 */ 508 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 509 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 510 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 511 spin_unlock(&sta->ps_lock); 512 return TX_CONTINUE; 513 } 514 515 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 516 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 517 ps_dbg(tx->sdata, 518 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 519 sta->sta.addr, ac); 520 ieee80211_free_txskb(&local->hw, old); 521 } else 522 tx->local->total_ps_buffered++; 523 524 info->control.jiffies = jiffies; 525 info->control.vif = &tx->sdata->vif; 526 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 527 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 528 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 529 spin_unlock(&sta->ps_lock); 530 531 if (!timer_pending(&local->sta_cleanup)) 532 mod_timer(&local->sta_cleanup, 533 round_jiffies(jiffies + 534 STA_INFO_CLEANUP_INTERVAL)); 535 536 /* 537 * We queued up some frames, so the TIM bit might 538 * need to be set, recalculate it. 539 */ 540 sta_info_recalc_tim(sta); 541 542 return TX_QUEUED; 543 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 544 ps_dbg(tx->sdata, 545 "STA %pM in PS mode, but polling/in SP -> send frame\n", 546 sta->sta.addr); 547 } 548 549 return TX_CONTINUE; 550 } 551 552 static ieee80211_tx_result debug_noinline ieee80211_tx_h_ps_buf(struct ieee80211_tx_data * tx)553 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 554 { 555 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 556 return TX_CONTINUE; 557 558 if (tx->flags & IEEE80211_TX_UNICAST) 559 return ieee80211_tx_h_unicast_ps_buf(tx); 560 else 561 return ieee80211_tx_h_multicast_ps_buf(tx); 562 } 563 564 static ieee80211_tx_result debug_noinline ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data * tx)565 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 566 { 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 569 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 570 if (tx->sdata->control_port_no_encrypt) 571 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 572 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 573 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 574 } 575 576 return TX_CONTINUE; 577 } 578 579 static ieee80211_tx_result debug_noinline ieee80211_tx_h_select_key(struct ieee80211_tx_data * tx)580 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 581 { 582 struct ieee80211_key *key; 583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 584 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 585 586 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 587 tx->key = NULL; 588 return TX_CONTINUE; 589 } 590 591 if (tx->sta && 592 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 593 tx->key = key; 594 else if (ieee80211_is_group_privacy_action(tx->skb) && 595 (key = rcu_dereference(tx->sdata->default_multicast_key))) 596 tx->key = key; 597 else if (ieee80211_is_mgmt(hdr->frame_control) && 598 is_multicast_ether_addr(hdr->addr1) && 599 ieee80211_is_robust_mgmt_frame(tx->skb) && 600 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 601 tx->key = key; 602 else if (is_multicast_ether_addr(hdr->addr1) && 603 (key = rcu_dereference(tx->sdata->default_multicast_key))) 604 tx->key = key; 605 else if (!is_multicast_ether_addr(hdr->addr1) && 606 (key = rcu_dereference(tx->sdata->default_unicast_key))) 607 tx->key = key; 608 else 609 tx->key = NULL; 610 611 if (tx->key) { 612 bool skip_hw = false; 613 614 /* TODO: add threshold stuff again */ 615 616 switch (tx->key->conf.cipher) { 617 case WLAN_CIPHER_SUITE_WEP40: 618 case WLAN_CIPHER_SUITE_WEP104: 619 case WLAN_CIPHER_SUITE_TKIP: 620 if (!ieee80211_is_data_present(hdr->frame_control)) 621 tx->key = NULL; 622 break; 623 case WLAN_CIPHER_SUITE_CCMP: 624 case WLAN_CIPHER_SUITE_CCMP_256: 625 case WLAN_CIPHER_SUITE_GCMP: 626 case WLAN_CIPHER_SUITE_GCMP_256: 627 if (!ieee80211_is_data_present(hdr->frame_control) && 628 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 629 tx->skb) && 630 !ieee80211_is_group_privacy_action(tx->skb)) 631 tx->key = NULL; 632 else 633 skip_hw = (tx->key->conf.flags & 634 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 635 ieee80211_is_mgmt(hdr->frame_control); 636 break; 637 case WLAN_CIPHER_SUITE_AES_CMAC: 638 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 639 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 640 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 641 if (!ieee80211_is_mgmt(hdr->frame_control)) 642 tx->key = NULL; 643 break; 644 } 645 646 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 647 !ieee80211_is_deauth(hdr->frame_control))) 648 return TX_DROP; 649 650 if (!skip_hw && tx->key && 651 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 652 info->control.hw_key = &tx->key->conf; 653 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 654 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 655 return TX_DROP; 656 } 657 658 return TX_CONTINUE; 659 } 660 661 static ieee80211_tx_result debug_noinline ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data * tx)662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 663 { 664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 665 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 666 struct ieee80211_supported_band *sband; 667 u32 len; 668 struct ieee80211_tx_rate_control txrc; 669 struct ieee80211_sta_rates *ratetbl = NULL; 670 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 671 bool assoc = false; 672 673 memset(&txrc, 0, sizeof(txrc)); 674 675 sband = tx->local->hw.wiphy->bands[info->band]; 676 677 len = min_t(u32, tx->skb->len + FCS_LEN, 678 tx->local->hw.wiphy->frag_threshold); 679 680 /* set up the tx rate control struct we give the RC algo */ 681 txrc.hw = &tx->local->hw; 682 txrc.sband = sband; 683 txrc.bss_conf = &tx->sdata->vif.bss_conf; 684 txrc.skb = tx->skb; 685 txrc.reported_rate.idx = -1; 686 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 687 688 if (tx->sdata->rc_has_mcs_mask[info->band]) 689 txrc.rate_idx_mcs_mask = 690 tx->sdata->rc_rateidx_mcs_mask[info->band]; 691 692 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 693 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 694 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 695 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 696 697 /* set up RTS protection if desired */ 698 if (len > tx->local->hw.wiphy->rts_threshold) { 699 txrc.rts = true; 700 } 701 702 info->control.use_rts = txrc.rts; 703 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 704 705 /* 706 * Use short preamble if the BSS can handle it, but not for 707 * management frames unless we know the receiver can handle 708 * that -- the management frame might be to a station that 709 * just wants a probe response. 710 */ 711 if (tx->sdata->vif.bss_conf.use_short_preamble && 712 (ieee80211_is_tx_data(tx->skb) || 713 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 714 txrc.short_preamble = true; 715 716 info->control.short_preamble = txrc.short_preamble; 717 718 /* don't ask rate control when rate already injected via radiotap */ 719 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 720 return TX_CONTINUE; 721 722 if (tx->sta) 723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 724 725 /* 726 * Lets not bother rate control if we're associated and cannot 727 * talk to the sta. This should not happen. 728 */ 729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 730 !rate_usable_index_exists(sband, &tx->sta->sta), 731 "%s: Dropped data frame as no usable bitrate found while " 732 "scanning and associated. Target station: " 733 "%pM on %d GHz band\n", 734 tx->sdata->name, 735 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 736 info->band ? 5 : 2)) 737 return TX_DROP; 738 739 /* 740 * If we're associated with the sta at this point we know we can at 741 * least send the frame at the lowest bit rate. 742 */ 743 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 744 745 if (tx->sta && !info->control.skip_table) 746 ratetbl = rcu_dereference(tx->sta->sta.rates); 747 748 if (unlikely(info->control.rates[0].idx < 0)) { 749 if (ratetbl) { 750 struct ieee80211_tx_rate rate = { 751 .idx = ratetbl->rate[0].idx, 752 .flags = ratetbl->rate[0].flags, 753 .count = ratetbl->rate[0].count 754 }; 755 756 if (ratetbl->rate[0].idx < 0) 757 return TX_DROP; 758 759 tx->rate = rate; 760 } else { 761 return TX_DROP; 762 } 763 } else { 764 tx->rate = info->control.rates[0]; 765 } 766 767 if (txrc.reported_rate.idx < 0) { 768 txrc.reported_rate = tx->rate; 769 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 770 tx->sta->tx_stats.last_rate = txrc.reported_rate; 771 } else if (tx->sta) 772 tx->sta->tx_stats.last_rate = txrc.reported_rate; 773 774 if (ratetbl) 775 return TX_CONTINUE; 776 777 if (unlikely(!info->control.rates[0].count)) 778 info->control.rates[0].count = 1; 779 780 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 781 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 782 info->control.rates[0].count = 1; 783 784 return TX_CONTINUE; 785 } 786 ieee80211_tx_next_seq(struct sta_info * sta,int tid)787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 788 { 789 u16 *seq = &sta->tid_seq[tid]; 790 __le16 ret = cpu_to_le16(*seq); 791 792 /* Increase the sequence number. */ 793 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 794 795 return ret; 796 } 797 798 static ieee80211_tx_result debug_noinline ieee80211_tx_h_sequence(struct ieee80211_tx_data * tx)799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 800 { 801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 803 int tid; 804 805 /* 806 * Packet injection may want to control the sequence 807 * number, if we have no matching interface then we 808 * neither assign one ourselves nor ask the driver to. 809 */ 810 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 811 return TX_CONTINUE; 812 813 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 814 return TX_CONTINUE; 815 816 if (ieee80211_hdrlen(hdr->frame_control) < 24) 817 return TX_CONTINUE; 818 819 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 820 return TX_CONTINUE; 821 822 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 823 return TX_CONTINUE; 824 825 /* 826 * Anything but QoS data that has a sequence number field 827 * (is long enough) gets a sequence number from the global 828 * counter. QoS data frames with a multicast destination 829 * also use the global counter (802.11-2012 9.3.2.10). 830 */ 831 if (!ieee80211_is_data_qos(hdr->frame_control) || 832 is_multicast_ether_addr(hdr->addr1)) { 833 /* driver should assign sequence number */ 834 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 835 /* for pure STA mode without beacons, we can do it */ 836 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 837 tx->sdata->sequence_number += 0x10; 838 if (tx->sta) 839 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 840 return TX_CONTINUE; 841 } 842 843 /* 844 * This should be true for injected/management frames only, for 845 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 846 * above since they are not QoS-data frames. 847 */ 848 if (!tx->sta) 849 return TX_CONTINUE; 850 851 /* include per-STA, per-TID sequence counter */ 852 tid = ieee80211_get_tid(hdr); 853 tx->sta->tx_stats.msdu[tid]++; 854 855 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 856 857 return TX_CONTINUE; 858 } 859 ieee80211_fragment(struct ieee80211_tx_data * tx,struct sk_buff * skb,int hdrlen,int frag_threshold)860 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 861 struct sk_buff *skb, int hdrlen, 862 int frag_threshold) 863 { 864 struct ieee80211_local *local = tx->local; 865 struct ieee80211_tx_info *info; 866 struct sk_buff *tmp; 867 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 868 int pos = hdrlen + per_fragm; 869 int rem = skb->len - hdrlen - per_fragm; 870 871 if (WARN_ON(rem < 0)) 872 return -EINVAL; 873 874 /* first fragment was already added to queue by caller */ 875 876 while (rem) { 877 int fraglen = per_fragm; 878 879 if (fraglen > rem) 880 fraglen = rem; 881 rem -= fraglen; 882 tmp = dev_alloc_skb(local->tx_headroom + 883 frag_threshold + 884 tx->sdata->encrypt_headroom + 885 IEEE80211_ENCRYPT_TAILROOM); 886 if (!tmp) 887 return -ENOMEM; 888 889 __skb_queue_tail(&tx->skbs, tmp); 890 891 skb_reserve(tmp, 892 local->tx_headroom + tx->sdata->encrypt_headroom); 893 894 /* copy control information */ 895 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 896 897 info = IEEE80211_SKB_CB(tmp); 898 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 899 IEEE80211_TX_CTL_FIRST_FRAGMENT); 900 901 if (rem) 902 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 903 904 skb_copy_queue_mapping(tmp, skb); 905 tmp->priority = skb->priority; 906 tmp->dev = skb->dev; 907 908 /* copy header and data */ 909 skb_put_data(tmp, skb->data, hdrlen); 910 skb_put_data(tmp, skb->data + pos, fraglen); 911 912 pos += fraglen; 913 } 914 915 /* adjust first fragment's length */ 916 skb_trim(skb, hdrlen + per_fragm); 917 return 0; 918 } 919 920 static ieee80211_tx_result debug_noinline ieee80211_tx_h_fragment(struct ieee80211_tx_data * tx)921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 922 { 923 struct sk_buff *skb = tx->skb; 924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 925 struct ieee80211_hdr *hdr = (void *)skb->data; 926 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 927 int hdrlen; 928 int fragnum; 929 930 /* no matter what happens, tx->skb moves to tx->skbs */ 931 __skb_queue_tail(&tx->skbs, skb); 932 tx->skb = NULL; 933 934 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 935 return TX_CONTINUE; 936 937 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 938 return TX_CONTINUE; 939 940 /* 941 * Warn when submitting a fragmented A-MPDU frame and drop it. 942 * This scenario is handled in ieee80211_tx_prepare but extra 943 * caution taken here as fragmented ampdu may cause Tx stop. 944 */ 945 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 946 return TX_DROP; 947 948 hdrlen = ieee80211_hdrlen(hdr->frame_control); 949 950 /* internal error, why isn't DONTFRAG set? */ 951 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 952 return TX_DROP; 953 954 /* 955 * Now fragment the frame. This will allocate all the fragments and 956 * chain them (using skb as the first fragment) to skb->next. 957 * During transmission, we will remove the successfully transmitted 958 * fragments from this list. When the low-level driver rejects one 959 * of the fragments then we will simply pretend to accept the skb 960 * but store it away as pending. 961 */ 962 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 963 return TX_DROP; 964 965 /* update duration/seq/flags of fragments */ 966 fragnum = 0; 967 968 skb_queue_walk(&tx->skbs, skb) { 969 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 970 971 hdr = (void *)skb->data; 972 info = IEEE80211_SKB_CB(skb); 973 974 if (!skb_queue_is_last(&tx->skbs, skb)) { 975 hdr->frame_control |= morefrags; 976 /* 977 * No multi-rate retries for fragmented frames, that 978 * would completely throw off the NAV at other STAs. 979 */ 980 info->control.rates[1].idx = -1; 981 info->control.rates[2].idx = -1; 982 info->control.rates[3].idx = -1; 983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 984 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 985 } else { 986 hdr->frame_control &= ~morefrags; 987 } 988 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 989 fragnum++; 990 } 991 992 return TX_CONTINUE; 993 } 994 995 static ieee80211_tx_result debug_noinline ieee80211_tx_h_stats(struct ieee80211_tx_data * tx)996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 997 { 998 struct sk_buff *skb; 999 int ac = -1; 1000 1001 if (!tx->sta) 1002 return TX_CONTINUE; 1003 1004 skb_queue_walk(&tx->skbs, skb) { 1005 ac = skb_get_queue_mapping(skb); 1006 tx->sta->tx_stats.bytes[ac] += skb->len; 1007 } 1008 if (ac >= 0) 1009 tx->sta->tx_stats.packets[ac]++; 1010 1011 return TX_CONTINUE; 1012 } 1013 1014 static ieee80211_tx_result debug_noinline ieee80211_tx_h_encrypt(struct ieee80211_tx_data * tx)1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1016 { 1017 if (!tx->key) 1018 return TX_CONTINUE; 1019 1020 switch (tx->key->conf.cipher) { 1021 case WLAN_CIPHER_SUITE_WEP40: 1022 case WLAN_CIPHER_SUITE_WEP104: 1023 return ieee80211_crypto_wep_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_TKIP: 1025 return ieee80211_crypto_tkip_encrypt(tx); 1026 case WLAN_CIPHER_SUITE_CCMP: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_CCMP_256: 1030 return ieee80211_crypto_ccmp_encrypt( 1031 tx, IEEE80211_CCMP_256_MIC_LEN); 1032 case WLAN_CIPHER_SUITE_AES_CMAC: 1033 return ieee80211_crypto_aes_cmac_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1038 return ieee80211_crypto_aes_gmac_encrypt(tx); 1039 case WLAN_CIPHER_SUITE_GCMP: 1040 case WLAN_CIPHER_SUITE_GCMP_256: 1041 return ieee80211_crypto_gcmp_encrypt(tx); 1042 default: 1043 return ieee80211_crypto_hw_encrypt(tx); 1044 } 1045 1046 return TX_DROP; 1047 } 1048 1049 static ieee80211_tx_result debug_noinline ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data * tx)1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1051 { 1052 struct sk_buff *skb; 1053 struct ieee80211_hdr *hdr; 1054 int next_len; 1055 bool group_addr; 1056 1057 skb_queue_walk(&tx->skbs, skb) { 1058 hdr = (void *) skb->data; 1059 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1060 break; /* must not overwrite AID */ 1061 if (!skb_queue_is_last(&tx->skbs, skb)) { 1062 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1063 next_len = next->len; 1064 } else 1065 next_len = 0; 1066 group_addr = is_multicast_ether_addr(hdr->addr1); 1067 1068 hdr->duration_id = 1069 ieee80211_duration(tx, skb, group_addr, next_len); 1070 } 1071 1072 return TX_CONTINUE; 1073 } 1074 1075 /* actual transmit path */ 1076 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)1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1078 struct sk_buff *skb, 1079 struct ieee80211_tx_info *info, 1080 struct tid_ampdu_tx *tid_tx, 1081 int tid) 1082 { 1083 bool queued = false; 1084 bool reset_agg_timer = false; 1085 struct sk_buff *purge_skb = NULL; 1086 1087 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1088 info->flags |= IEEE80211_TX_CTL_AMPDU; 1089 reset_agg_timer = true; 1090 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1091 /* 1092 * nothing -- this aggregation session is being started 1093 * but that might still fail with the driver 1094 */ 1095 } else if (!tx->sta->sta.txq[tid]) { 1096 spin_lock(&tx->sta->lock); 1097 /* 1098 * Need to re-check now, because we may get here 1099 * 1100 * 1) in the window during which the setup is actually 1101 * already done, but not marked yet because not all 1102 * packets are spliced over to the driver pending 1103 * queue yet -- if this happened we acquire the lock 1104 * either before or after the splice happens, but 1105 * need to recheck which of these cases happened. 1106 * 1107 * 2) during session teardown, if the OPERATIONAL bit 1108 * was cleared due to the teardown but the pointer 1109 * hasn't been assigned NULL yet (or we loaded it 1110 * before it was assigned) -- in this case it may 1111 * now be NULL which means we should just let the 1112 * packet pass through because splicing the frames 1113 * back is already done. 1114 */ 1115 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1116 1117 if (!tid_tx) { 1118 /* do nothing, let packet pass through */ 1119 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1120 info->flags |= IEEE80211_TX_CTL_AMPDU; 1121 reset_agg_timer = true; 1122 } else { 1123 queued = true; 1124 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1125 clear_sta_flag(tx->sta, WLAN_STA_SP); 1126 ps_dbg(tx->sta->sdata, 1127 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1128 tx->sta->sta.addr, tx->sta->sta.aid); 1129 } 1130 info->control.vif = &tx->sdata->vif; 1131 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1132 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1133 __skb_queue_tail(&tid_tx->pending, skb); 1134 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1135 purge_skb = __skb_dequeue(&tid_tx->pending); 1136 } 1137 spin_unlock(&tx->sta->lock); 1138 1139 if (purge_skb) 1140 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1141 } 1142 1143 /* reset session timer */ 1144 if (reset_agg_timer) 1145 tid_tx->last_tx = jiffies; 1146 1147 return queued; 1148 } 1149 1150 static void ieee80211_aggr_check(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1151 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1152 struct sta_info *sta, 1153 struct sk_buff *skb) 1154 { 1155 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1156 u16 tid; 1157 1158 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1159 return; 1160 1161 if (!sta || !sta->sta.ht_cap.ht_supported || 1162 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1163 skb->protocol == sdata->control_port_protocol) 1164 return; 1165 1166 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1167 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1168 return; 1169 1170 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1171 } 1172 1173 /* 1174 * initialises @tx 1175 * pass %NULL for the station if unknown, a valid pointer if known 1176 * or an ERR_PTR() if the station is known not to exist 1177 */ 1178 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)1179 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1180 struct ieee80211_tx_data *tx, 1181 struct sta_info *sta, struct sk_buff *skb) 1182 { 1183 struct ieee80211_local *local = sdata->local; 1184 struct ieee80211_hdr *hdr; 1185 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1186 bool aggr_check = false; 1187 int tid; 1188 1189 memset(tx, 0, sizeof(*tx)); 1190 tx->skb = skb; 1191 tx->local = local; 1192 tx->sdata = sdata; 1193 __skb_queue_head_init(&tx->skbs); 1194 1195 /* 1196 * If this flag is set to true anywhere, and we get here, 1197 * we are doing the needed processing, so remove the flag 1198 * now. 1199 */ 1200 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1201 1202 hdr = (struct ieee80211_hdr *) skb->data; 1203 1204 if (likely(sta)) { 1205 if (!IS_ERR(sta)) 1206 tx->sta = sta; 1207 } else { 1208 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1209 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1210 if (!tx->sta && sdata->wdev.use_4addr) 1211 return TX_DROP; 1212 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1213 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1214 } 1215 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1216 tx->sta = sta_info_get(sdata, hdr->addr1); 1217 aggr_check = true; 1218 } 1219 } 1220 1221 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1222 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1223 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1224 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1225 struct tid_ampdu_tx *tid_tx; 1226 1227 tid = ieee80211_get_tid(hdr); 1228 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1229 if (!tid_tx && aggr_check) { 1230 ieee80211_aggr_check(sdata, tx->sta, skb); 1231 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1232 } 1233 1234 if (tid_tx) { 1235 bool queued; 1236 1237 queued = ieee80211_tx_prep_agg(tx, skb, info, 1238 tid_tx, tid); 1239 1240 if (unlikely(queued)) 1241 return TX_QUEUED; 1242 } 1243 } 1244 1245 if (is_multicast_ether_addr(hdr->addr1)) { 1246 tx->flags &= ~IEEE80211_TX_UNICAST; 1247 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1248 } else 1249 tx->flags |= IEEE80211_TX_UNICAST; 1250 1251 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1252 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1253 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1254 info->flags & IEEE80211_TX_CTL_AMPDU) 1255 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1256 } 1257 1258 if (!tx->sta) 1259 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1260 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1261 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1262 ieee80211_check_fast_xmit(tx->sta); 1263 } 1264 1265 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1266 1267 return TX_CONTINUE; 1268 } 1269 ieee80211_get_txq(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff * skb)1270 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1271 struct ieee80211_vif *vif, 1272 struct sta_info *sta, 1273 struct sk_buff *skb) 1274 { 1275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1276 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1277 struct ieee80211_txq *txq = NULL; 1278 1279 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1280 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1281 return NULL; 1282 1283 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1284 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1285 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1286 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1287 vif->type == NL80211_IFTYPE_STATION) && 1288 sta && sta->uploaded) { 1289 /* 1290 * This will be NULL if the driver didn't set the 1291 * opt-in hardware flag. 1292 */ 1293 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1294 } 1295 } else if (sta) { 1296 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1297 1298 if (!sta->uploaded) 1299 return NULL; 1300 1301 txq = sta->sta.txq[tid]; 1302 } else if (vif) { 1303 txq = vif->txq; 1304 } 1305 1306 if (!txq) 1307 return NULL; 1308 1309 return to_txq_info(txq); 1310 } 1311 ieee80211_set_skb_enqueue_time(struct sk_buff * skb)1312 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1313 { 1314 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1315 } 1316 codel_skb_len_func(const struct sk_buff * skb)1317 static u32 codel_skb_len_func(const struct sk_buff *skb) 1318 { 1319 return skb->len; 1320 } 1321 codel_skb_time_func(const struct sk_buff * skb)1322 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1323 { 1324 const struct ieee80211_tx_info *info; 1325 1326 info = (const struct ieee80211_tx_info *)skb->cb; 1327 return info->control.enqueue_time; 1328 } 1329 codel_dequeue_func(struct codel_vars * cvars,void * ctx)1330 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1331 void *ctx) 1332 { 1333 struct ieee80211_local *local; 1334 struct txq_info *txqi; 1335 struct fq *fq; 1336 struct fq_flow *flow; 1337 1338 txqi = ctx; 1339 local = vif_to_sdata(txqi->txq.vif)->local; 1340 fq = &local->fq; 1341 1342 if (cvars == &txqi->def_cvars) 1343 flow = &txqi->tin.default_flow; 1344 else 1345 flow = &fq->flows[cvars - local->cvars]; 1346 1347 return fq_flow_dequeue(fq, flow); 1348 } 1349 codel_drop_func(struct sk_buff * skb,void * ctx)1350 static void codel_drop_func(struct sk_buff *skb, 1351 void *ctx) 1352 { 1353 struct ieee80211_local *local; 1354 struct ieee80211_hw *hw; 1355 struct txq_info *txqi; 1356 1357 txqi = ctx; 1358 local = vif_to_sdata(txqi->txq.vif)->local; 1359 hw = &local->hw; 1360 1361 ieee80211_free_txskb(hw, skb); 1362 } 1363 fq_tin_dequeue_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow)1364 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1365 struct fq_tin *tin, 1366 struct fq_flow *flow) 1367 { 1368 struct ieee80211_local *local; 1369 struct txq_info *txqi; 1370 struct codel_vars *cvars; 1371 struct codel_params *cparams; 1372 struct codel_stats *cstats; 1373 1374 local = container_of(fq, struct ieee80211_local, fq); 1375 txqi = container_of(tin, struct txq_info, tin); 1376 cstats = &txqi->cstats; 1377 1378 if (txqi->txq.sta) { 1379 struct sta_info *sta = container_of(txqi->txq.sta, 1380 struct sta_info, sta); 1381 cparams = &sta->cparams; 1382 } else { 1383 cparams = &local->cparams; 1384 } 1385 1386 if (flow == &tin->default_flow) 1387 cvars = &txqi->def_cvars; 1388 else 1389 cvars = &local->cvars[flow - fq->flows]; 1390 1391 return codel_dequeue(txqi, 1392 &flow->backlog, 1393 cparams, 1394 cvars, 1395 cstats, 1396 codel_skb_len_func, 1397 codel_skb_time_func, 1398 codel_drop_func, 1399 codel_dequeue_func); 1400 } 1401 fq_skb_free_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb)1402 static void fq_skb_free_func(struct fq *fq, 1403 struct fq_tin *tin, 1404 struct fq_flow *flow, 1405 struct sk_buff *skb) 1406 { 1407 struct ieee80211_local *local; 1408 1409 local = container_of(fq, struct ieee80211_local, fq); 1410 ieee80211_free_txskb(&local->hw, skb); 1411 } 1412 ieee80211_txq_enqueue(struct ieee80211_local * local,struct txq_info * txqi,struct sk_buff * skb)1413 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1414 struct txq_info *txqi, 1415 struct sk_buff *skb) 1416 { 1417 struct fq *fq = &local->fq; 1418 struct fq_tin *tin = &txqi->tin; 1419 u32 flow_idx = fq_flow_idx(fq, skb); 1420 1421 ieee80211_set_skb_enqueue_time(skb); 1422 1423 spin_lock_bh(&fq->lock); 1424 /* 1425 * For management frames, don't really apply codel etc., 1426 * we don't want to apply any shaping or anything we just 1427 * want to simplify the driver API by having them on the 1428 * txqi. 1429 */ 1430 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1431 IEEE80211_SKB_CB(skb)->control.flags |= 1432 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1433 __skb_queue_tail(&txqi->frags, skb); 1434 } else { 1435 fq_tin_enqueue(fq, tin, flow_idx, skb, 1436 fq_skb_free_func); 1437 } 1438 spin_unlock_bh(&fq->lock); 1439 } 1440 fq_vlan_filter_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb,void * data)1441 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1442 struct fq_flow *flow, struct sk_buff *skb, 1443 void *data) 1444 { 1445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1446 1447 return info->control.vif == data; 1448 } 1449 ieee80211_txq_remove_vlan(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1450 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1451 struct ieee80211_sub_if_data *sdata) 1452 { 1453 struct fq *fq = &local->fq; 1454 struct txq_info *txqi; 1455 struct fq_tin *tin; 1456 struct ieee80211_sub_if_data *ap; 1457 1458 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1459 return; 1460 1461 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1462 1463 if (!ap->vif.txq) 1464 return; 1465 1466 txqi = to_txq_info(ap->vif.txq); 1467 tin = &txqi->tin; 1468 1469 spin_lock_bh(&fq->lock); 1470 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1471 fq_skb_free_func); 1472 spin_unlock_bh(&fq->lock); 1473 } 1474 ieee80211_txq_init(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct txq_info * txqi,int tid)1475 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1476 struct sta_info *sta, 1477 struct txq_info *txqi, int tid) 1478 { 1479 fq_tin_init(&txqi->tin); 1480 codel_vars_init(&txqi->def_cvars); 1481 codel_stats_init(&txqi->cstats); 1482 __skb_queue_head_init(&txqi->frags); 1483 RB_CLEAR_NODE(&txqi->schedule_order); 1484 1485 txqi->txq.vif = &sdata->vif; 1486 1487 if (!sta) { 1488 sdata->vif.txq = &txqi->txq; 1489 txqi->txq.tid = 0; 1490 txqi->txq.ac = IEEE80211_AC_BE; 1491 1492 return; 1493 } 1494 1495 if (tid == IEEE80211_NUM_TIDS) { 1496 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1497 /* Drivers need to opt in to the management MPDU TXQ */ 1498 if (!ieee80211_hw_check(&sdata->local->hw, 1499 STA_MMPDU_TXQ)) 1500 return; 1501 } else if (!ieee80211_hw_check(&sdata->local->hw, 1502 BUFF_MMPDU_TXQ)) { 1503 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1504 return; 1505 } 1506 txqi->txq.ac = IEEE80211_AC_VO; 1507 } else { 1508 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1509 } 1510 1511 txqi->txq.sta = &sta->sta; 1512 txqi->txq.tid = tid; 1513 sta->sta.txq[tid] = &txqi->txq; 1514 } 1515 ieee80211_txq_purge(struct ieee80211_local * local,struct txq_info * txqi)1516 void ieee80211_txq_purge(struct ieee80211_local *local, 1517 struct txq_info *txqi) 1518 { 1519 struct fq *fq = &local->fq; 1520 struct fq_tin *tin = &txqi->tin; 1521 1522 spin_lock_bh(&fq->lock); 1523 fq_tin_reset(fq, tin, fq_skb_free_func); 1524 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1525 spin_unlock_bh(&fq->lock); 1526 1527 ieee80211_unschedule_txq(&local->hw, &txqi->txq, true); 1528 } 1529 ieee80211_txq_set_params(struct ieee80211_local * local)1530 void ieee80211_txq_set_params(struct ieee80211_local *local) 1531 { 1532 if (local->hw.wiphy->txq_limit) 1533 local->fq.limit = local->hw.wiphy->txq_limit; 1534 else 1535 local->hw.wiphy->txq_limit = local->fq.limit; 1536 1537 if (local->hw.wiphy->txq_memory_limit) 1538 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1539 else 1540 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1541 1542 if (local->hw.wiphy->txq_quantum) 1543 local->fq.quantum = local->hw.wiphy->txq_quantum; 1544 else 1545 local->hw.wiphy->txq_quantum = local->fq.quantum; 1546 } 1547 ieee80211_txq_setup_flows(struct ieee80211_local * local)1548 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1549 { 1550 struct fq *fq = &local->fq; 1551 int ret; 1552 int i; 1553 bool supp_vht = false; 1554 enum nl80211_band band; 1555 1556 if (!local->ops->wake_tx_queue) 1557 return 0; 1558 1559 ret = fq_init(fq, 4096); 1560 if (ret) 1561 return ret; 1562 1563 /* 1564 * If the hardware doesn't support VHT, it is safe to limit the maximum 1565 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1566 */ 1567 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1568 struct ieee80211_supported_band *sband; 1569 1570 sband = local->hw.wiphy->bands[band]; 1571 if (!sband) 1572 continue; 1573 1574 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1575 } 1576 1577 if (!supp_vht) 1578 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1579 1580 codel_params_init(&local->cparams); 1581 local->cparams.interval = MS2TIME(100); 1582 local->cparams.target = MS2TIME(20); 1583 local->cparams.ecn = true; 1584 1585 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1586 GFP_KERNEL); 1587 if (!local->cvars) { 1588 spin_lock_bh(&fq->lock); 1589 fq_reset(fq, fq_skb_free_func); 1590 spin_unlock_bh(&fq->lock); 1591 return -ENOMEM; 1592 } 1593 1594 for (i = 0; i < fq->flows_cnt; i++) 1595 codel_vars_init(&local->cvars[i]); 1596 1597 ieee80211_txq_set_params(local); 1598 1599 return 0; 1600 } 1601 ieee80211_txq_teardown_flows(struct ieee80211_local * local)1602 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1603 { 1604 struct fq *fq = &local->fq; 1605 1606 if (!local->ops->wake_tx_queue) 1607 return; 1608 1609 kfree(local->cvars); 1610 local->cvars = NULL; 1611 1612 spin_lock_bh(&fq->lock); 1613 fq_reset(fq, fq_skb_free_func); 1614 spin_unlock_bh(&fq->lock); 1615 } 1616 ieee80211_queue_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1617 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1618 struct ieee80211_sub_if_data *sdata, 1619 struct sta_info *sta, 1620 struct sk_buff *skb) 1621 { 1622 struct ieee80211_vif *vif; 1623 struct txq_info *txqi; 1624 1625 if (!local->ops->wake_tx_queue || 1626 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1627 return false; 1628 1629 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1630 sdata = container_of(sdata->bss, 1631 struct ieee80211_sub_if_data, u.ap); 1632 1633 vif = &sdata->vif; 1634 txqi = ieee80211_get_txq(local, vif, sta, skb); 1635 1636 if (!txqi) 1637 return false; 1638 1639 ieee80211_txq_enqueue(local, txqi, skb); 1640 1641 schedule_and_wake_txq(local, txqi); 1642 1643 return true; 1644 } 1645 ieee80211_tx_frags(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff_head * skbs,bool txpending)1646 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1647 struct ieee80211_vif *vif, 1648 struct sta_info *sta, 1649 struct sk_buff_head *skbs, 1650 bool txpending) 1651 { 1652 struct ieee80211_tx_control control = {}; 1653 struct sk_buff *skb, *tmp; 1654 unsigned long flags; 1655 1656 skb_queue_walk_safe(skbs, skb, tmp) { 1657 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1658 int q = info->hw_queue; 1659 1660 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1661 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1662 __skb_unlink(skb, skbs); 1663 ieee80211_free_txskb(&local->hw, skb); 1664 continue; 1665 } 1666 #endif 1667 1668 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1669 if (local->queue_stop_reasons[q] || 1670 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1671 if (unlikely(info->flags & 1672 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1673 if (local->queue_stop_reasons[q] & 1674 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1675 /* 1676 * Drop off-channel frames if queues 1677 * are stopped for any reason other 1678 * than off-channel operation. Never 1679 * queue them. 1680 */ 1681 spin_unlock_irqrestore( 1682 &local->queue_stop_reason_lock, 1683 flags); 1684 ieee80211_purge_tx_queue(&local->hw, 1685 skbs); 1686 return true; 1687 } 1688 } else { 1689 1690 /* 1691 * Since queue is stopped, queue up frames for 1692 * later transmission from the tx-pending 1693 * tasklet when the queue is woken again. 1694 */ 1695 if (txpending) 1696 skb_queue_splice_init(skbs, 1697 &local->pending[q]); 1698 else 1699 skb_queue_splice_tail_init(skbs, 1700 &local->pending[q]); 1701 1702 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1703 flags); 1704 return false; 1705 } 1706 } 1707 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1708 1709 info->control.vif = vif; 1710 control.sta = sta ? &sta->sta : NULL; 1711 1712 __skb_unlink(skb, skbs); 1713 drv_tx(local, &control, skb); 1714 } 1715 1716 return true; 1717 } 1718 1719 /* 1720 * Returns false if the frame couldn't be transmitted but was queued instead. 1721 */ __ieee80211_tx(struct ieee80211_local * local,struct sk_buff_head * skbs,int led_len,struct sta_info * sta,bool txpending)1722 static bool __ieee80211_tx(struct ieee80211_local *local, 1723 struct sk_buff_head *skbs, int led_len, 1724 struct sta_info *sta, bool txpending) 1725 { 1726 struct ieee80211_tx_info *info; 1727 struct ieee80211_sub_if_data *sdata; 1728 struct ieee80211_vif *vif; 1729 struct sk_buff *skb; 1730 bool result; 1731 __le16 fc; 1732 1733 if (WARN_ON(skb_queue_empty(skbs))) 1734 return true; 1735 1736 skb = skb_peek(skbs); 1737 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1738 info = IEEE80211_SKB_CB(skb); 1739 sdata = vif_to_sdata(info->control.vif); 1740 if (sta && !sta->uploaded) 1741 sta = NULL; 1742 1743 switch (sdata->vif.type) { 1744 case NL80211_IFTYPE_MONITOR: 1745 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1746 vif = &sdata->vif; 1747 break; 1748 } 1749 sdata = rcu_dereference(local->monitor_sdata); 1750 if (sdata) { 1751 vif = &sdata->vif; 1752 info->hw_queue = 1753 vif->hw_queue[skb_get_queue_mapping(skb)]; 1754 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1755 ieee80211_purge_tx_queue(&local->hw, skbs); 1756 return true; 1757 } else 1758 vif = NULL; 1759 break; 1760 case NL80211_IFTYPE_AP_VLAN: 1761 sdata = container_of(sdata->bss, 1762 struct ieee80211_sub_if_data, u.ap); 1763 fallthrough; 1764 default: 1765 vif = &sdata->vif; 1766 break; 1767 } 1768 1769 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1770 1771 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1772 1773 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1774 1775 return result; 1776 } 1777 1778 /* 1779 * Invoke TX handlers, return 0 on success and non-zero if the 1780 * frame was dropped or queued. 1781 * 1782 * The handlers are split into an early and late part. The latter is everything 1783 * that can be sensitive to reordering, and will be deferred to after packets 1784 * are dequeued from the intermediate queues (when they are enabled). 1785 */ invoke_tx_handlers_early(struct ieee80211_tx_data * tx)1786 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1787 { 1788 ieee80211_tx_result res = TX_DROP; 1789 1790 #define CALL_TXH(txh) \ 1791 do { \ 1792 res = txh(tx); \ 1793 if (res != TX_CONTINUE) \ 1794 goto txh_done; \ 1795 } while (0) 1796 1797 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1798 CALL_TXH(ieee80211_tx_h_check_assoc); 1799 CALL_TXH(ieee80211_tx_h_ps_buf); 1800 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1801 CALL_TXH(ieee80211_tx_h_select_key); 1802 1803 txh_done: 1804 if (unlikely(res == TX_DROP)) { 1805 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1806 if (tx->skb) 1807 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1808 else 1809 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1810 return -1; 1811 } else if (unlikely(res == TX_QUEUED)) { 1812 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1813 return -1; 1814 } 1815 1816 return 0; 1817 } 1818 1819 /* 1820 * Late handlers can be called while the sta lock is held. Handlers that can 1821 * cause packets to be generated will cause deadlock! 1822 */ invoke_tx_handlers_late(struct ieee80211_tx_data * tx)1823 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1824 { 1825 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1826 ieee80211_tx_result res = TX_CONTINUE; 1827 1828 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1829 __skb_queue_tail(&tx->skbs, tx->skb); 1830 tx->skb = NULL; 1831 goto txh_done; 1832 } 1833 1834 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1835 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1836 1837 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1838 CALL_TXH(ieee80211_tx_h_sequence); 1839 CALL_TXH(ieee80211_tx_h_fragment); 1840 /* handlers after fragment must be aware of tx info fragmentation! */ 1841 CALL_TXH(ieee80211_tx_h_stats); 1842 CALL_TXH(ieee80211_tx_h_encrypt); 1843 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1844 CALL_TXH(ieee80211_tx_h_calculate_duration); 1845 #undef CALL_TXH 1846 1847 txh_done: 1848 if (unlikely(res == TX_DROP)) { 1849 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1850 if (tx->skb) 1851 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1852 else 1853 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1854 return -1; 1855 } else if (unlikely(res == TX_QUEUED)) { 1856 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1857 return -1; 1858 } 1859 1860 return 0; 1861 } 1862 invoke_tx_handlers(struct ieee80211_tx_data * tx)1863 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1864 { 1865 int r = invoke_tx_handlers_early(tx); 1866 1867 if (r) 1868 return r; 1869 return invoke_tx_handlers_late(tx); 1870 } 1871 ieee80211_tx_prepare_skb(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct sk_buff * skb,int band,struct ieee80211_sta ** sta)1872 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1873 struct ieee80211_vif *vif, struct sk_buff *skb, 1874 int band, struct ieee80211_sta **sta) 1875 { 1876 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1877 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1878 struct ieee80211_tx_data tx; 1879 struct sk_buff *skb2; 1880 1881 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1882 return false; 1883 1884 info->band = band; 1885 info->control.vif = vif; 1886 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1887 1888 if (invoke_tx_handlers(&tx)) 1889 return false; 1890 1891 if (sta) { 1892 if (tx.sta) 1893 *sta = &tx.sta->sta; 1894 else 1895 *sta = NULL; 1896 } 1897 1898 /* this function isn't suitable for fragmented data frames */ 1899 skb2 = __skb_dequeue(&tx.skbs); 1900 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1901 ieee80211_free_txskb(hw, skb2); 1902 ieee80211_purge_tx_queue(hw, &tx.skbs); 1903 return false; 1904 } 1905 1906 return true; 1907 } 1908 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1909 1910 /* 1911 * Returns false if the frame couldn't be transmitted but was queued instead. 1912 */ ieee80211_tx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb,bool txpending)1913 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1914 struct sta_info *sta, struct sk_buff *skb, 1915 bool txpending) 1916 { 1917 struct ieee80211_local *local = sdata->local; 1918 struct ieee80211_tx_data tx; 1919 ieee80211_tx_result res_prepare; 1920 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1921 bool result = true; 1922 int led_len; 1923 1924 if (unlikely(skb->len < 10)) { 1925 dev_kfree_skb(skb); 1926 return true; 1927 } 1928 1929 /* initialises tx */ 1930 led_len = skb->len; 1931 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1932 1933 if (unlikely(res_prepare == TX_DROP)) { 1934 ieee80211_free_txskb(&local->hw, skb); 1935 return true; 1936 } else if (unlikely(res_prepare == TX_QUEUED)) { 1937 return true; 1938 } 1939 1940 /* set up hw_queue value early */ 1941 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1942 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1943 info->hw_queue = 1944 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1945 1946 if (invoke_tx_handlers_early(&tx)) 1947 return true; 1948 1949 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1950 return true; 1951 1952 if (!invoke_tx_handlers_late(&tx)) 1953 result = __ieee80211_tx(local, &tx.skbs, led_len, 1954 tx.sta, txpending); 1955 1956 return result; 1957 } 1958 1959 /* device xmit handlers */ 1960 1961 enum ieee80211_encrypt { 1962 ENCRYPT_NO, 1963 ENCRYPT_MGMT, 1964 ENCRYPT_DATA, 1965 }; 1966 ieee80211_skb_resize(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int head_need,enum ieee80211_encrypt encrypt)1967 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1968 struct sk_buff *skb, 1969 int head_need, 1970 enum ieee80211_encrypt encrypt) 1971 { 1972 struct ieee80211_local *local = sdata->local; 1973 bool enc_tailroom; 1974 int tail_need = 0; 1975 1976 enc_tailroom = encrypt == ENCRYPT_MGMT || 1977 (encrypt == ENCRYPT_DATA && 1978 sdata->crypto_tx_tailroom_needed_cnt); 1979 1980 if (enc_tailroom) { 1981 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1982 tail_need -= skb_tailroom(skb); 1983 tail_need = max_t(int, tail_need, 0); 1984 } 1985 1986 if (skb_cloned(skb) && 1987 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1988 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1989 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1990 else if (head_need || tail_need) 1991 I802_DEBUG_INC(local->tx_expand_skb_head); 1992 else 1993 return 0; 1994 1995 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1996 wiphy_debug(local->hw.wiphy, 1997 "failed to reallocate TX buffer\n"); 1998 return -ENOMEM; 1999 } 2000 2001 return 0; 2002 } 2003 ieee80211_xmit(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)2004 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2005 struct sta_info *sta, struct sk_buff *skb) 2006 { 2007 struct ieee80211_local *local = sdata->local; 2008 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2009 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2010 int headroom; 2011 enum ieee80211_encrypt encrypt; 2012 2013 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2014 encrypt = ENCRYPT_NO; 2015 else if (ieee80211_is_mgmt(hdr->frame_control)) 2016 encrypt = ENCRYPT_MGMT; 2017 else 2018 encrypt = ENCRYPT_DATA; 2019 2020 headroom = local->tx_headroom; 2021 if (encrypt != ENCRYPT_NO) 2022 headroom += sdata->encrypt_headroom; 2023 headroom -= skb_headroom(skb); 2024 headroom = max_t(int, 0, headroom); 2025 2026 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2027 ieee80211_free_txskb(&local->hw, skb); 2028 return; 2029 } 2030 2031 /* reload after potential resize */ 2032 hdr = (struct ieee80211_hdr *) skb->data; 2033 info->control.vif = &sdata->vif; 2034 2035 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2036 if (ieee80211_is_data(hdr->frame_control) && 2037 is_unicast_ether_addr(hdr->addr1)) { 2038 if (mesh_nexthop_resolve(sdata, skb)) 2039 return; /* skb queued: don't free */ 2040 } else { 2041 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2042 } 2043 } 2044 2045 ieee80211_set_qos_hdr(sdata, skb); 2046 ieee80211_tx(sdata, sta, skb, false); 2047 } 2048 ieee80211_validate_radiotap_len(struct sk_buff * skb)2049 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2050 { 2051 struct ieee80211_radiotap_header *rthdr = 2052 (struct ieee80211_radiotap_header *)skb->data; 2053 2054 /* check for not even having the fixed radiotap header part */ 2055 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2056 return false; /* too short to be possibly valid */ 2057 2058 /* is it a header version we can trust to find length from? */ 2059 if (unlikely(rthdr->it_version)) 2060 return false; /* only version 0 is supported */ 2061 2062 /* does the skb contain enough to deliver on the alleged length? */ 2063 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2064 return false; /* skb too short for claimed rt header extent */ 2065 2066 return true; 2067 } 2068 ieee80211_parse_tx_radiotap(struct sk_buff * skb,struct net_device * dev)2069 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2070 struct net_device *dev) 2071 { 2072 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2073 struct ieee80211_radiotap_iterator iterator; 2074 struct ieee80211_radiotap_header *rthdr = 2075 (struct ieee80211_radiotap_header *) skb->data; 2076 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2077 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2078 NULL); 2079 u16 txflags; 2080 u16 rate = 0; 2081 bool rate_found = false; 2082 u8 rate_retries = 0; 2083 u16 rate_flags = 0; 2084 u8 mcs_known, mcs_flags, mcs_bw; 2085 u16 vht_known; 2086 u8 vht_mcs = 0, vht_nss = 0; 2087 int i; 2088 2089 if (!ieee80211_validate_radiotap_len(skb)) 2090 return false; 2091 2092 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2093 IEEE80211_TX_CTL_DONTFRAG; 2094 2095 /* 2096 * for every radiotap entry that is present 2097 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2098 * entries present, or -EINVAL on error) 2099 */ 2100 2101 while (!ret) { 2102 ret = ieee80211_radiotap_iterator_next(&iterator); 2103 2104 if (ret) 2105 continue; 2106 2107 /* see if this argument is something we can use */ 2108 switch (iterator.this_arg_index) { 2109 /* 2110 * You must take care when dereferencing iterator.this_arg 2111 * for multibyte types... the pointer is not aligned. Use 2112 * get_unaligned((type *)iterator.this_arg) to dereference 2113 * iterator.this_arg for type "type" safely on all arches. 2114 */ 2115 case IEEE80211_RADIOTAP_FLAGS: 2116 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2117 /* 2118 * this indicates that the skb we have been 2119 * handed has the 32-bit FCS CRC at the end... 2120 * we should react to that by snipping it off 2121 * because it will be recomputed and added 2122 * on transmission 2123 */ 2124 if (skb->len < (iterator._max_length + FCS_LEN)) 2125 return false; 2126 2127 skb_trim(skb, skb->len - FCS_LEN); 2128 } 2129 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2130 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2131 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2132 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2133 break; 2134 2135 case IEEE80211_RADIOTAP_TX_FLAGS: 2136 txflags = get_unaligned_le16(iterator.this_arg); 2137 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2138 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2139 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2140 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2141 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2142 info->control.flags |= 2143 IEEE80211_TX_CTRL_DONT_REORDER; 2144 break; 2145 2146 case IEEE80211_RADIOTAP_RATE: 2147 rate = *iterator.this_arg; 2148 rate_flags = 0; 2149 rate_found = true; 2150 break; 2151 2152 case IEEE80211_RADIOTAP_DATA_RETRIES: 2153 rate_retries = *iterator.this_arg; 2154 break; 2155 2156 case IEEE80211_RADIOTAP_MCS: 2157 mcs_known = iterator.this_arg[0]; 2158 mcs_flags = iterator.this_arg[1]; 2159 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2160 break; 2161 2162 rate_found = true; 2163 rate = iterator.this_arg[2]; 2164 rate_flags = IEEE80211_TX_RC_MCS; 2165 2166 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2167 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2168 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2169 2170 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2171 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2172 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2173 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2174 2175 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2176 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2177 info->flags |= IEEE80211_TX_CTL_LDPC; 2178 2179 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2180 u8 stbc = u8_get_bits(mcs_flags, 2181 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2182 2183 info->flags |= 2184 u32_encode_bits(stbc, 2185 IEEE80211_TX_CTL_STBC); 2186 } 2187 break; 2188 2189 case IEEE80211_RADIOTAP_VHT: 2190 vht_known = get_unaligned_le16(iterator.this_arg); 2191 rate_found = true; 2192 2193 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2194 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2195 (iterator.this_arg[2] & 2196 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2197 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2198 if (vht_known & 2199 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2200 if (iterator.this_arg[3] == 1) 2201 rate_flags |= 2202 IEEE80211_TX_RC_40_MHZ_WIDTH; 2203 else if (iterator.this_arg[3] == 4) 2204 rate_flags |= 2205 IEEE80211_TX_RC_80_MHZ_WIDTH; 2206 else if (iterator.this_arg[3] == 11) 2207 rate_flags |= 2208 IEEE80211_TX_RC_160_MHZ_WIDTH; 2209 } 2210 2211 vht_mcs = iterator.this_arg[4] >> 4; 2212 if (vht_mcs > 11) 2213 vht_mcs = 0; 2214 vht_nss = iterator.this_arg[4] & 0xF; 2215 if (!vht_nss || vht_nss > 8) 2216 vht_nss = 1; 2217 break; 2218 2219 /* 2220 * Please update the file 2221 * Documentation/networking/mac80211-injection.rst 2222 * when parsing new fields here. 2223 */ 2224 2225 default: 2226 break; 2227 } 2228 } 2229 2230 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2231 return false; 2232 2233 if (rate_found) { 2234 struct ieee80211_supported_band *sband = 2235 local->hw.wiphy->bands[info->band]; 2236 2237 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2238 2239 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2240 info->control.rates[i].idx = -1; 2241 info->control.rates[i].flags = 0; 2242 info->control.rates[i].count = 0; 2243 } 2244 2245 if (rate_flags & IEEE80211_TX_RC_MCS) { 2246 info->control.rates[0].idx = rate; 2247 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2248 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2249 vht_nss); 2250 } else if (sband) { 2251 for (i = 0; i < sband->n_bitrates; i++) { 2252 if (rate * 5 != sband->bitrates[i].bitrate) 2253 continue; 2254 2255 info->control.rates[0].idx = i; 2256 break; 2257 } 2258 } 2259 2260 if (info->control.rates[0].idx < 0) 2261 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2262 2263 info->control.rates[0].flags = rate_flags; 2264 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2265 local->hw.max_rate_tries); 2266 } 2267 2268 return true; 2269 } 2270 ieee80211_monitor_start_xmit(struct sk_buff * skb,struct net_device * dev)2271 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2272 struct net_device *dev) 2273 { 2274 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2275 struct ieee80211_chanctx_conf *chanctx_conf; 2276 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2277 struct ieee80211_hdr *hdr; 2278 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2279 struct cfg80211_chan_def *chandef; 2280 u16 len_rthdr; 2281 int hdrlen; 2282 2283 memset(info, 0, sizeof(*info)); 2284 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2285 IEEE80211_TX_CTL_INJECTED; 2286 2287 /* Sanity-check the length of the radiotap header */ 2288 if (!ieee80211_validate_radiotap_len(skb)) 2289 goto fail; 2290 2291 /* we now know there is a radiotap header with a length we can use */ 2292 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2293 2294 /* 2295 * fix up the pointers accounting for the radiotap 2296 * header still being in there. We are being given 2297 * a precooked IEEE80211 header so no need for 2298 * normal processing 2299 */ 2300 skb_set_mac_header(skb, len_rthdr); 2301 /* 2302 * these are just fixed to the end of the rt area since we 2303 * don't have any better information and at this point, nobody cares 2304 */ 2305 skb_set_network_header(skb, len_rthdr); 2306 skb_set_transport_header(skb, len_rthdr); 2307 2308 if (skb->len < len_rthdr + 2) 2309 goto fail; 2310 2311 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2312 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2313 2314 if (skb->len < len_rthdr + hdrlen) 2315 goto fail; 2316 2317 /* 2318 * Initialize skb->protocol if the injected frame is a data frame 2319 * carrying a rfc1042 header 2320 */ 2321 if (ieee80211_is_data(hdr->frame_control) && 2322 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2323 u8 *payload = (u8 *)hdr + hdrlen; 2324 2325 if (ether_addr_equal(payload, rfc1042_header)) 2326 skb->protocol = cpu_to_be16((payload[6] << 8) | 2327 payload[7]); 2328 } 2329 2330 rcu_read_lock(); 2331 2332 /* 2333 * We process outgoing injected frames that have a local address 2334 * we handle as though they are non-injected frames. 2335 * This code here isn't entirely correct, the local MAC address 2336 * isn't always enough to find the interface to use; for proper 2337 * VLAN support we have an nl80211-based mechanism. 2338 * 2339 * This is necessary, for example, for old hostapd versions that 2340 * don't use nl80211-based management TX/RX. 2341 */ 2342 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2343 2344 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2345 if (!ieee80211_sdata_running(tmp_sdata)) 2346 continue; 2347 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2348 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2349 continue; 2350 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2351 sdata = tmp_sdata; 2352 break; 2353 } 2354 } 2355 2356 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2357 if (!chanctx_conf) { 2358 tmp_sdata = rcu_dereference(local->monitor_sdata); 2359 if (tmp_sdata) 2360 chanctx_conf = 2361 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2362 } 2363 2364 if (chanctx_conf) 2365 chandef = &chanctx_conf->def; 2366 else if (!local->use_chanctx) 2367 chandef = &local->_oper_chandef; 2368 else 2369 goto fail_rcu; 2370 2371 /* 2372 * Frame injection is not allowed if beaconing is not allowed 2373 * or if we need radar detection. Beaconing is usually not allowed when 2374 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2375 * Passive scan is also used in world regulatory domains where 2376 * your country is not known and as such it should be treated as 2377 * NO TX unless the channel is explicitly allowed in which case 2378 * your current regulatory domain would not have the passive scan 2379 * flag. 2380 * 2381 * Since AP mode uses monitor interfaces to inject/TX management 2382 * frames we can make AP mode the exception to this rule once it 2383 * supports radar detection as its implementation can deal with 2384 * radar detection by itself. We can do that later by adding a 2385 * monitor flag interfaces used for AP support. 2386 */ 2387 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2388 sdata->vif.type)) 2389 goto fail_rcu; 2390 2391 info->band = chandef->chan->band; 2392 2393 /* Initialize skb->priority according to frame type and TID class, 2394 * with respect to the sub interface that the frame will actually 2395 * be transmitted on. If the DONT_REORDER flag is set, the original 2396 * skb-priority is preserved to assure frames injected with this 2397 * flag are not reordered relative to each other. 2398 */ 2399 ieee80211_select_queue_80211(sdata, skb, hdr); 2400 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2401 2402 /* 2403 * Process the radiotap header. This will now take into account the 2404 * selected chandef above to accurately set injection rates and 2405 * retransmissions. 2406 */ 2407 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2408 goto fail_rcu; 2409 2410 /* remove the injection radiotap header */ 2411 skb_pull(skb, len_rthdr); 2412 2413 ieee80211_xmit(sdata, NULL, skb); 2414 rcu_read_unlock(); 2415 2416 return NETDEV_TX_OK; 2417 2418 fail_rcu: 2419 rcu_read_unlock(); 2420 fail: 2421 dev_kfree_skb(skb); 2422 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2423 } 2424 ieee80211_is_tdls_setup(struct sk_buff * skb)2425 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2426 { 2427 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2428 2429 return ethertype == ETH_P_TDLS && 2430 skb->len > 14 && 2431 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2432 } 2433 ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info ** sta_out)2434 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2435 struct sk_buff *skb, 2436 struct sta_info **sta_out) 2437 { 2438 struct sta_info *sta; 2439 2440 switch (sdata->vif.type) { 2441 case NL80211_IFTYPE_AP_VLAN: 2442 sta = rcu_dereference(sdata->u.vlan.sta); 2443 if (sta) { 2444 *sta_out = sta; 2445 return 0; 2446 } else if (sdata->wdev.use_4addr) { 2447 return -ENOLINK; 2448 } 2449 fallthrough; 2450 case NL80211_IFTYPE_AP: 2451 case NL80211_IFTYPE_OCB: 2452 case NL80211_IFTYPE_ADHOC: 2453 if (is_multicast_ether_addr(skb->data)) { 2454 *sta_out = ERR_PTR(-ENOENT); 2455 return 0; 2456 } 2457 sta = sta_info_get_bss(sdata, skb->data); 2458 break; 2459 #ifdef CONFIG_MAC80211_MESH 2460 case NL80211_IFTYPE_MESH_POINT: 2461 /* determined much later */ 2462 *sta_out = NULL; 2463 return 0; 2464 #endif 2465 case NL80211_IFTYPE_STATION: 2466 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2467 sta = sta_info_get(sdata, skb->data); 2468 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2469 if (test_sta_flag(sta, 2470 WLAN_STA_TDLS_PEER_AUTH)) { 2471 *sta_out = sta; 2472 return 0; 2473 } 2474 2475 /* 2476 * TDLS link during setup - throw out frames to 2477 * peer. Allow TDLS-setup frames to unauthorized 2478 * peers for the special case of a link teardown 2479 * after a TDLS sta is removed due to being 2480 * unreachable. 2481 */ 2482 if (!ieee80211_is_tdls_setup(skb)) 2483 return -EINVAL; 2484 } 2485 2486 } 2487 2488 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2489 if (!sta) 2490 return -ENOLINK; 2491 break; 2492 default: 2493 return -EINVAL; 2494 } 2495 2496 *sta_out = sta ?: ERR_PTR(-ENOENT); 2497 return 0; 2498 } 2499 ieee80211_store_ack_skb(struct ieee80211_local * local,struct sk_buff * skb,u32 * info_flags,u64 * cookie)2500 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2501 struct sk_buff *skb, 2502 u32 *info_flags, 2503 u64 *cookie) 2504 { 2505 struct sk_buff *ack_skb; 2506 u16 info_id = 0; 2507 2508 if (skb->sk) 2509 ack_skb = skb_clone_sk(skb); 2510 else 2511 ack_skb = skb_clone(skb, GFP_ATOMIC); 2512 2513 if (ack_skb) { 2514 unsigned long flags; 2515 int id; 2516 2517 spin_lock_irqsave(&local->ack_status_lock, flags); 2518 id = idr_alloc(&local->ack_status_frames, ack_skb, 2519 1, 0x2000, GFP_ATOMIC); 2520 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2521 2522 if (id >= 0) { 2523 info_id = id; 2524 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2525 if (cookie) { 2526 *cookie = ieee80211_mgmt_tx_cookie(local); 2527 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2528 } 2529 } else { 2530 kfree_skb(ack_skb); 2531 } 2532 } 2533 2534 return info_id; 2535 } 2536 2537 /** 2538 * ieee80211_build_hdr - build 802.11 header in the given frame 2539 * @sdata: virtual interface to build the header for 2540 * @skb: the skb to build the header in 2541 * @info_flags: skb flags to set 2542 * @sta: the station pointer 2543 * @ctrl_flags: info control flags to set 2544 * @cookie: cookie pointer to fill (if not %NULL) 2545 * 2546 * This function takes the skb with 802.3 header and reformats the header to 2547 * the appropriate IEEE 802.11 header based on which interface the packet is 2548 * being transmitted on. 2549 * 2550 * Note that this function also takes care of the TX status request and 2551 * potential unsharing of the SKB - this needs to be interleaved with the 2552 * header building. 2553 * 2554 * The function requires the read-side RCU lock held 2555 * 2556 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2557 */ 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)2558 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2559 struct sk_buff *skb, u32 info_flags, 2560 struct sta_info *sta, u32 ctrl_flags, 2561 u64 *cookie) 2562 { 2563 struct ieee80211_local *local = sdata->local; 2564 struct ieee80211_tx_info *info; 2565 int head_need; 2566 u16 ethertype, hdrlen, meshhdrlen = 0; 2567 __le16 fc; 2568 struct ieee80211_hdr hdr; 2569 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2570 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2571 const u8 *encaps_data; 2572 int encaps_len, skip_header_bytes; 2573 bool wme_sta = false, authorized = false; 2574 bool tdls_peer; 2575 bool multicast; 2576 u16 info_id = 0; 2577 struct ieee80211_chanctx_conf *chanctx_conf; 2578 struct ieee80211_sub_if_data *ap_sdata; 2579 enum nl80211_band band; 2580 int ret; 2581 2582 if (IS_ERR(sta)) 2583 sta = NULL; 2584 2585 #ifdef CONFIG_MAC80211_DEBUGFS 2586 if (local->force_tx_status) 2587 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2588 #endif 2589 2590 /* convert Ethernet header to proper 802.11 header (based on 2591 * operation mode) */ 2592 ethertype = (skb->data[12] << 8) | skb->data[13]; 2593 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2594 2595 switch (sdata->vif.type) { 2596 case NL80211_IFTYPE_AP_VLAN: 2597 if (sdata->wdev.use_4addr) { 2598 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2599 /* RA TA DA SA */ 2600 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2601 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2602 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2603 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2604 hdrlen = 30; 2605 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2606 wme_sta = sta->sta.wme; 2607 } 2608 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2609 u.ap); 2610 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2611 if (!chanctx_conf) { 2612 ret = -ENOTCONN; 2613 goto free; 2614 } 2615 band = chanctx_conf->def.chan->band; 2616 if (sdata->wdev.use_4addr) 2617 break; 2618 fallthrough; 2619 case NL80211_IFTYPE_AP: 2620 if (sdata->vif.type == NL80211_IFTYPE_AP) 2621 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2622 if (!chanctx_conf) { 2623 ret = -ENOTCONN; 2624 goto free; 2625 } 2626 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2627 /* DA BSSID SA */ 2628 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2629 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2630 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2631 hdrlen = 24; 2632 band = chanctx_conf->def.chan->band; 2633 break; 2634 #ifdef CONFIG_MAC80211_MESH 2635 case NL80211_IFTYPE_MESH_POINT: 2636 if (!is_multicast_ether_addr(skb->data)) { 2637 struct sta_info *next_hop; 2638 bool mpp_lookup = true; 2639 2640 mpath = mesh_path_lookup(sdata, skb->data); 2641 if (mpath) { 2642 mpp_lookup = false; 2643 next_hop = rcu_dereference(mpath->next_hop); 2644 if (!next_hop || 2645 !(mpath->flags & (MESH_PATH_ACTIVE | 2646 MESH_PATH_RESOLVING))) 2647 mpp_lookup = true; 2648 } 2649 2650 if (mpp_lookup) { 2651 mppath = mpp_path_lookup(sdata, skb->data); 2652 if (mppath) 2653 mppath->exp_time = jiffies; 2654 } 2655 2656 if (mppath && mpath) 2657 mesh_path_del(sdata, mpath->dst); 2658 } 2659 2660 /* 2661 * Use address extension if it is a packet from 2662 * another interface or if we know the destination 2663 * is being proxied by a portal (i.e. portal address 2664 * differs from proxied address) 2665 */ 2666 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2667 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2668 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2669 skb->data, skb->data + ETH_ALEN); 2670 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2671 NULL, NULL); 2672 } else { 2673 /* DS -> MBSS (802.11-2012 13.11.3.3). 2674 * For unicast with unknown forwarding information, 2675 * destination might be in the MBSS or if that fails 2676 * forwarded to another mesh gate. In either case 2677 * resolution will be handled in ieee80211_xmit(), so 2678 * leave the original DA. This also works for mcast */ 2679 const u8 *mesh_da = skb->data; 2680 2681 if (mppath) 2682 mesh_da = mppath->mpp; 2683 else if (mpath) 2684 mesh_da = mpath->dst; 2685 2686 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2687 mesh_da, sdata->vif.addr); 2688 if (is_multicast_ether_addr(mesh_da)) 2689 /* DA TA mSA AE:SA */ 2690 meshhdrlen = ieee80211_new_mesh_header( 2691 sdata, &mesh_hdr, 2692 skb->data + ETH_ALEN, NULL); 2693 else 2694 /* RA TA mDA mSA AE:DA SA */ 2695 meshhdrlen = ieee80211_new_mesh_header( 2696 sdata, &mesh_hdr, skb->data, 2697 skb->data + ETH_ALEN); 2698 2699 } 2700 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2701 if (!chanctx_conf) { 2702 ret = -ENOTCONN; 2703 goto free; 2704 } 2705 band = chanctx_conf->def.chan->band; 2706 2707 /* For injected frames, fill RA right away as nexthop lookup 2708 * will be skipped. 2709 */ 2710 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2711 is_zero_ether_addr(hdr.addr1)) 2712 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2713 break; 2714 #endif 2715 case NL80211_IFTYPE_STATION: 2716 /* we already did checks when looking up the RA STA */ 2717 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2718 2719 if (tdls_peer) { 2720 /* DA SA BSSID */ 2721 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2722 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2723 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2724 hdrlen = 24; 2725 } else if (sdata->u.mgd.use_4addr && 2726 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2727 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2728 IEEE80211_FCTL_TODS); 2729 /* RA TA DA SA */ 2730 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2731 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2732 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2733 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2734 hdrlen = 30; 2735 } else { 2736 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2737 /* BSSID SA DA */ 2738 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2739 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2740 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2741 hdrlen = 24; 2742 } 2743 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2744 if (!chanctx_conf) { 2745 ret = -ENOTCONN; 2746 goto free; 2747 } 2748 band = chanctx_conf->def.chan->band; 2749 break; 2750 case NL80211_IFTYPE_OCB: 2751 /* DA SA BSSID */ 2752 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2753 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2754 eth_broadcast_addr(hdr.addr3); 2755 hdrlen = 24; 2756 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2757 if (!chanctx_conf) { 2758 ret = -ENOTCONN; 2759 goto free; 2760 } 2761 band = chanctx_conf->def.chan->band; 2762 break; 2763 case NL80211_IFTYPE_ADHOC: 2764 /* DA SA BSSID */ 2765 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2766 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2767 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2768 hdrlen = 24; 2769 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2770 if (!chanctx_conf) { 2771 ret = -ENOTCONN; 2772 goto free; 2773 } 2774 band = chanctx_conf->def.chan->band; 2775 break; 2776 default: 2777 ret = -EINVAL; 2778 goto free; 2779 } 2780 2781 multicast = is_multicast_ether_addr(hdr.addr1); 2782 2783 /* sta is always NULL for mesh */ 2784 if (sta) { 2785 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2786 wme_sta = sta->sta.wme; 2787 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2788 /* For mesh, the use of the QoS header is mandatory */ 2789 wme_sta = true; 2790 } 2791 2792 /* receiver does QoS (which also means we do) use it */ 2793 if (wme_sta) { 2794 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2795 hdrlen += 2; 2796 } 2797 2798 /* 2799 * Drop unicast frames to unauthorised stations unless they are 2800 * EAPOL frames from the local station. 2801 */ 2802 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2803 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2804 !multicast && !authorized && 2805 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2806 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2807 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2808 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2809 sdata->name, hdr.addr1); 2810 #endif 2811 2812 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2813 2814 ret = -EPERM; 2815 goto free; 2816 } 2817 2818 if (unlikely(!multicast && ((skb->sk && 2819 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2820 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2821 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2822 cookie); 2823 2824 /* 2825 * If the skb is shared we need to obtain our own copy. 2826 */ 2827 if (skb_shared(skb)) { 2828 struct sk_buff *tmp_skb = skb; 2829 2830 /* can't happen -- skb is a clone if info_id != 0 */ 2831 WARN_ON(info_id); 2832 2833 skb = skb_clone(skb, GFP_ATOMIC); 2834 kfree_skb(tmp_skb); 2835 2836 if (!skb) { 2837 ret = -ENOMEM; 2838 goto free; 2839 } 2840 } 2841 2842 hdr.frame_control = fc; 2843 hdr.duration_id = 0; 2844 hdr.seq_ctrl = 0; 2845 2846 skip_header_bytes = ETH_HLEN; 2847 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2848 encaps_data = bridge_tunnel_header; 2849 encaps_len = sizeof(bridge_tunnel_header); 2850 skip_header_bytes -= 2; 2851 } else if (ethertype >= ETH_P_802_3_MIN) { 2852 encaps_data = rfc1042_header; 2853 encaps_len = sizeof(rfc1042_header); 2854 skip_header_bytes -= 2; 2855 } else { 2856 encaps_data = NULL; 2857 encaps_len = 0; 2858 } 2859 2860 skb_pull(skb, skip_header_bytes); 2861 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2862 2863 /* 2864 * So we need to modify the skb header and hence need a copy of 2865 * that. The head_need variable above doesn't, so far, include 2866 * the needed header space that we don't need right away. If we 2867 * can, then we don't reallocate right now but only after the 2868 * frame arrives at the master device (if it does...) 2869 * 2870 * If we cannot, however, then we will reallocate to include all 2871 * the ever needed space. Also, if we need to reallocate it anyway, 2872 * make it big enough for everything we may ever need. 2873 */ 2874 2875 if (head_need > 0 || skb_cloned(skb)) { 2876 head_need += sdata->encrypt_headroom; 2877 head_need += local->tx_headroom; 2878 head_need = max_t(int, 0, head_need); 2879 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2880 ieee80211_free_txskb(&local->hw, skb); 2881 skb = NULL; 2882 return ERR_PTR(-ENOMEM); 2883 } 2884 } 2885 2886 if (encaps_data) 2887 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2888 2889 #ifdef CONFIG_MAC80211_MESH 2890 if (meshhdrlen > 0) 2891 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2892 #endif 2893 2894 if (ieee80211_is_data_qos(fc)) { 2895 __le16 *qos_control; 2896 2897 qos_control = skb_push(skb, 2); 2898 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2899 /* 2900 * Maybe we could actually set some fields here, for now just 2901 * initialise to zero to indicate no special operation. 2902 */ 2903 *qos_control = 0; 2904 } else 2905 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2906 2907 skb_reset_mac_header(skb); 2908 2909 info = IEEE80211_SKB_CB(skb); 2910 memset(info, 0, sizeof(*info)); 2911 2912 info->flags = info_flags; 2913 info->ack_frame_id = info_id; 2914 info->band = band; 2915 info->control.flags = ctrl_flags; 2916 2917 return skb; 2918 free: 2919 kfree_skb(skb); 2920 return ERR_PTR(ret); 2921 } 2922 2923 /* 2924 * fast-xmit overview 2925 * 2926 * The core idea of this fast-xmit is to remove per-packet checks by checking 2927 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2928 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2929 * much less work can be done per packet. For example, fragmentation must be 2930 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2931 * in the code here. 2932 * 2933 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2934 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2935 * 2936 * The most difficult part of this is that when any of these assumptions 2937 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2938 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2939 * since the per-packet code no longer checks the conditions. This is reflected 2940 * by the calls to these functions throughout the rest of the code, and must be 2941 * maintained if any of the TX path checks change. 2942 */ 2943 ieee80211_check_fast_xmit(struct sta_info * sta)2944 void ieee80211_check_fast_xmit(struct sta_info *sta) 2945 { 2946 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2947 struct ieee80211_local *local = sta->local; 2948 struct ieee80211_sub_if_data *sdata = sta->sdata; 2949 struct ieee80211_hdr *hdr = (void *)build.hdr; 2950 struct ieee80211_chanctx_conf *chanctx_conf; 2951 __le16 fc; 2952 2953 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2954 return; 2955 2956 /* Locking here protects both the pointer itself, and against concurrent 2957 * invocations winning data access races to, e.g., the key pointer that 2958 * is used. 2959 * Without it, the invocation of this function right after the key 2960 * pointer changes wouldn't be sufficient, as another CPU could access 2961 * the pointer, then stall, and then do the cache update after the CPU 2962 * that invalidated the key. 2963 * With the locking, such scenarios cannot happen as the check for the 2964 * key and the fast-tx assignment are done atomically, so the CPU that 2965 * modifies the key will either wait or other one will see the key 2966 * cleared/changed already. 2967 */ 2968 spin_lock_bh(&sta->lock); 2969 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2970 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2971 sdata->vif.type == NL80211_IFTYPE_STATION) 2972 goto out; 2973 2974 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2975 goto out; 2976 2977 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2978 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2979 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2980 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2981 goto out; 2982 2983 if (sdata->noack_map) 2984 goto out; 2985 2986 /* fast-xmit doesn't handle fragmentation at all */ 2987 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2988 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2989 goto out; 2990 2991 rcu_read_lock(); 2992 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2993 if (!chanctx_conf) { 2994 rcu_read_unlock(); 2995 goto out; 2996 } 2997 build.band = chanctx_conf->def.chan->band; 2998 rcu_read_unlock(); 2999 3000 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3001 3002 switch (sdata->vif.type) { 3003 case NL80211_IFTYPE_ADHOC: 3004 /* DA SA BSSID */ 3005 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3006 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3007 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3008 build.hdr_len = 24; 3009 break; 3010 case NL80211_IFTYPE_STATION: 3011 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3012 /* DA SA BSSID */ 3013 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3014 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3015 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 3016 build.hdr_len = 24; 3017 break; 3018 } 3019 3020 if (sdata->u.mgd.use_4addr) { 3021 /* non-regular ethertype cannot use the fastpath */ 3022 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3023 IEEE80211_FCTL_TODS); 3024 /* RA TA DA SA */ 3025 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 3026 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3027 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3028 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3029 build.hdr_len = 30; 3030 break; 3031 } 3032 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3033 /* BSSID SA DA */ 3034 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 3035 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3036 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3037 build.hdr_len = 24; 3038 break; 3039 case NL80211_IFTYPE_AP_VLAN: 3040 if (sdata->wdev.use_4addr) { 3041 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3042 IEEE80211_FCTL_TODS); 3043 /* RA TA DA SA */ 3044 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3045 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3046 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3047 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3048 build.hdr_len = 30; 3049 break; 3050 } 3051 fallthrough; 3052 case NL80211_IFTYPE_AP: 3053 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3054 /* DA BSSID SA */ 3055 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3056 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3057 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3058 build.hdr_len = 24; 3059 break; 3060 default: 3061 /* not handled on fast-xmit */ 3062 goto out; 3063 } 3064 3065 if (sta->sta.wme) { 3066 build.hdr_len += 2; 3067 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3068 } 3069 3070 /* We store the key here so there's no point in using rcu_dereference() 3071 * but that's fine because the code that changes the pointers will call 3072 * this function after doing so. For a single CPU that would be enough, 3073 * for multiple see the comment above. 3074 */ 3075 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3076 if (!build.key) 3077 build.key = rcu_access_pointer(sdata->default_unicast_key); 3078 if (build.key) { 3079 bool gen_iv, iv_spc, mmic; 3080 3081 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3082 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3083 mmic = build.key->conf.flags & 3084 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3085 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3086 3087 /* don't handle software crypto */ 3088 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3089 goto out; 3090 3091 /* Key is being removed */ 3092 if (build.key->flags & KEY_FLAG_TAINTED) 3093 goto out; 3094 3095 switch (build.key->conf.cipher) { 3096 case WLAN_CIPHER_SUITE_CCMP: 3097 case WLAN_CIPHER_SUITE_CCMP_256: 3098 if (gen_iv) 3099 build.pn_offs = build.hdr_len; 3100 if (gen_iv || iv_spc) 3101 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3102 break; 3103 case WLAN_CIPHER_SUITE_GCMP: 3104 case WLAN_CIPHER_SUITE_GCMP_256: 3105 if (gen_iv) 3106 build.pn_offs = build.hdr_len; 3107 if (gen_iv || iv_spc) 3108 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3109 break; 3110 case WLAN_CIPHER_SUITE_TKIP: 3111 /* cannot handle MMIC or IV generation in xmit-fast */ 3112 if (mmic || gen_iv) 3113 goto out; 3114 if (iv_spc) 3115 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3116 break; 3117 case WLAN_CIPHER_SUITE_WEP40: 3118 case WLAN_CIPHER_SUITE_WEP104: 3119 /* cannot handle IV generation in fast-xmit */ 3120 if (gen_iv) 3121 goto out; 3122 if (iv_spc) 3123 build.hdr_len += IEEE80211_WEP_IV_LEN; 3124 break; 3125 case WLAN_CIPHER_SUITE_AES_CMAC: 3126 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3127 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3128 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3129 WARN(1, 3130 "management cipher suite 0x%x enabled for data\n", 3131 build.key->conf.cipher); 3132 goto out; 3133 default: 3134 /* we don't know how to generate IVs for this at all */ 3135 if (WARN_ON(gen_iv)) 3136 goto out; 3137 /* pure hardware keys are OK, of course */ 3138 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3139 break; 3140 /* cipher scheme might require space allocation */ 3141 if (iv_spc && 3142 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3143 goto out; 3144 if (iv_spc) 3145 build.hdr_len += build.key->conf.iv_len; 3146 } 3147 3148 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3149 } 3150 3151 hdr->frame_control = fc; 3152 3153 memcpy(build.hdr + build.hdr_len, 3154 rfc1042_header, sizeof(rfc1042_header)); 3155 build.hdr_len += sizeof(rfc1042_header); 3156 3157 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3158 /* if the kmemdup fails, continue w/o fast_tx */ 3159 if (!fast_tx) 3160 goto out; 3161 3162 out: 3163 /* we might have raced against another call to this function */ 3164 old = rcu_dereference_protected(sta->fast_tx, 3165 lockdep_is_held(&sta->lock)); 3166 rcu_assign_pointer(sta->fast_tx, fast_tx); 3167 if (old) 3168 kfree_rcu(old, rcu_head); 3169 spin_unlock_bh(&sta->lock); 3170 } 3171 ieee80211_check_fast_xmit_all(struct ieee80211_local * local)3172 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3173 { 3174 struct sta_info *sta; 3175 3176 rcu_read_lock(); 3177 list_for_each_entry_rcu(sta, &local->sta_list, list) 3178 ieee80211_check_fast_xmit(sta); 3179 rcu_read_unlock(); 3180 } 3181 ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data * sdata)3182 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3183 { 3184 struct ieee80211_local *local = sdata->local; 3185 struct sta_info *sta; 3186 3187 rcu_read_lock(); 3188 3189 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3190 if (sdata != sta->sdata && 3191 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3192 continue; 3193 ieee80211_check_fast_xmit(sta); 3194 } 3195 3196 rcu_read_unlock(); 3197 } 3198 ieee80211_clear_fast_xmit(struct sta_info * sta)3199 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3200 { 3201 struct ieee80211_fast_tx *fast_tx; 3202 3203 spin_lock_bh(&sta->lock); 3204 fast_tx = rcu_dereference_protected(sta->fast_tx, 3205 lockdep_is_held(&sta->lock)); 3206 RCU_INIT_POINTER(sta->fast_tx, NULL); 3207 spin_unlock_bh(&sta->lock); 3208 3209 if (fast_tx) 3210 kfree_rcu(fast_tx, rcu_head); 3211 } 3212 ieee80211_amsdu_realloc_pad(struct ieee80211_local * local,struct sk_buff * skb,int headroom)3213 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3214 struct sk_buff *skb, int headroom) 3215 { 3216 if (skb_headroom(skb) < headroom) { 3217 I802_DEBUG_INC(local->tx_expand_skb_head); 3218 3219 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3220 wiphy_debug(local->hw.wiphy, 3221 "failed to reallocate TX buffer\n"); 3222 return false; 3223 } 3224 } 3225 3226 return true; 3227 } 3228 ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data * sdata,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3229 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3230 struct ieee80211_fast_tx *fast_tx, 3231 struct sk_buff *skb) 3232 { 3233 struct ieee80211_local *local = sdata->local; 3234 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3235 struct ieee80211_hdr *hdr; 3236 struct ethhdr *amsdu_hdr; 3237 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3238 int subframe_len = skb->len - hdr_len; 3239 void *data; 3240 u8 *qc, *h_80211_src, *h_80211_dst; 3241 const u8 *bssid; 3242 3243 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3244 return false; 3245 3246 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3247 return true; 3248 3249 if (!ieee80211_amsdu_realloc_pad(local, skb, 3250 sizeof(*amsdu_hdr) + 3251 local->hw.extra_tx_headroom)) 3252 return false; 3253 3254 data = skb_push(skb, sizeof(*amsdu_hdr)); 3255 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3256 hdr = data; 3257 amsdu_hdr = data + hdr_len; 3258 /* h_80211_src/dst is addr* field within hdr */ 3259 h_80211_src = data + fast_tx->sa_offs; 3260 h_80211_dst = data + fast_tx->da_offs; 3261 3262 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3263 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3264 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3265 3266 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3267 * fields needs to be changed to BSSID for A-MSDU frames depending 3268 * on FromDS/ToDS values. 3269 */ 3270 switch (sdata->vif.type) { 3271 case NL80211_IFTYPE_STATION: 3272 bssid = sdata->u.mgd.bssid; 3273 break; 3274 case NL80211_IFTYPE_AP: 3275 case NL80211_IFTYPE_AP_VLAN: 3276 bssid = sdata->vif.addr; 3277 break; 3278 default: 3279 bssid = NULL; 3280 } 3281 3282 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3283 ether_addr_copy(h_80211_src, bssid); 3284 3285 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3286 ether_addr_copy(h_80211_dst, bssid); 3287 3288 qc = ieee80211_get_qos_ctl(hdr); 3289 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3290 3291 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3292 3293 return true; 3294 } 3295 ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3296 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3297 struct sta_info *sta, 3298 struct ieee80211_fast_tx *fast_tx, 3299 struct sk_buff *skb) 3300 { 3301 struct ieee80211_local *local = sdata->local; 3302 struct fq *fq = &local->fq; 3303 struct fq_tin *tin; 3304 struct fq_flow *flow; 3305 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3306 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3307 struct txq_info *txqi; 3308 struct sk_buff **frag_tail, *head; 3309 int subframe_len = skb->len - ETH_ALEN; 3310 u8 max_subframes = sta->sta.max_amsdu_subframes; 3311 int max_frags = local->hw.max_tx_fragments; 3312 int max_amsdu_len = sta->sta.max_amsdu_len; 3313 int orig_truesize; 3314 u32 flow_idx; 3315 __be16 len; 3316 void *data; 3317 bool ret = false; 3318 unsigned int orig_len; 3319 int n = 2, nfrags, pad = 0; 3320 u16 hdrlen; 3321 3322 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3323 return false; 3324 3325 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3326 return false; 3327 3328 if (skb_is_gso(skb)) 3329 return false; 3330 3331 if (!txq) 3332 return false; 3333 3334 txqi = to_txq_info(txq); 3335 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3336 return false; 3337 3338 if (sta->sta.max_rc_amsdu_len) 3339 max_amsdu_len = min_t(int, max_amsdu_len, 3340 sta->sta.max_rc_amsdu_len); 3341 3342 if (sta->sta.max_tid_amsdu_len[tid]) 3343 max_amsdu_len = min_t(int, max_amsdu_len, 3344 sta->sta.max_tid_amsdu_len[tid]); 3345 3346 flow_idx = fq_flow_idx(fq, skb); 3347 3348 spin_lock_bh(&fq->lock); 3349 3350 /* TODO: Ideally aggregation should be done on dequeue to remain 3351 * responsive to environment changes. 3352 */ 3353 3354 tin = &txqi->tin; 3355 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3356 head = skb_peek_tail(&flow->queue); 3357 if (!head || skb_is_gso(head)) 3358 goto out; 3359 3360 orig_truesize = head->truesize; 3361 orig_len = head->len; 3362 3363 if (skb->len + head->len > max_amsdu_len) 3364 goto out; 3365 3366 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3367 nfrags += 1 + skb_shinfo(head)->nr_frags; 3368 frag_tail = &skb_shinfo(head)->frag_list; 3369 while (*frag_tail) { 3370 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3371 frag_tail = &(*frag_tail)->next; 3372 n++; 3373 } 3374 3375 if (max_subframes && n > max_subframes) 3376 goto out; 3377 3378 if (max_frags && nfrags > max_frags) 3379 goto out; 3380 3381 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3382 goto out; 3383 3384 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3385 goto out; 3386 3387 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3388 * and frag_tail should be &skb_shinfo(head)->frag_list. 3389 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3390 * Reload frag_tail to have it pointing to the correct place. 3391 */ 3392 if (n == 2) 3393 frag_tail = &skb_shinfo(head)->frag_list; 3394 3395 /* 3396 * Pad out the previous subframe to a multiple of 4 by adding the 3397 * padding to the next one, that's being added. Note that head->len 3398 * is the length of the full A-MSDU, but that works since each time 3399 * we add a new subframe we pad out the previous one to a multiple 3400 * of 4 and thus it no longer matters in the next round. 3401 */ 3402 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3403 if ((head->len - hdrlen) & 3) 3404 pad = 4 - ((head->len - hdrlen) & 3); 3405 3406 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3407 2 + pad)) 3408 goto out_recalc; 3409 3410 ret = true; 3411 data = skb_push(skb, ETH_ALEN + 2); 3412 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3413 3414 data += 2 * ETH_ALEN; 3415 len = cpu_to_be16(subframe_len); 3416 memcpy(data, &len, 2); 3417 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3418 3419 memset(skb_push(skb, pad), 0, pad); 3420 3421 head->len += skb->len; 3422 head->data_len += skb->len; 3423 *frag_tail = skb; 3424 3425 out_recalc: 3426 fq->memory_usage += head->truesize - orig_truesize; 3427 if (head->len != orig_len) { 3428 flow->backlog += head->len - orig_len; 3429 tin->backlog_bytes += head->len - orig_len; 3430 } 3431 out: 3432 spin_unlock_bh(&fq->lock); 3433 3434 return ret; 3435 } 3436 3437 /* 3438 * Can be called while the sta lock is held. Anything that can cause packets to 3439 * be generated will cause deadlock! 3440 */ 3441 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)3442 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3443 struct sta_info *sta, u8 pn_offs, 3444 struct ieee80211_key *key, 3445 struct ieee80211_tx_data *tx) 3446 { 3447 struct sk_buff *skb = tx->skb; 3448 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3449 struct ieee80211_hdr *hdr = (void *)skb->data; 3450 u8 tid = IEEE80211_NUM_TIDS; 3451 3452 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3453 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3454 return TX_DROP; 3455 3456 if (key) 3457 info->control.hw_key = &key->conf; 3458 3459 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3460 3461 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3462 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3463 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3464 } else { 3465 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3466 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3467 sdata->sequence_number += 0x10; 3468 } 3469 3470 if (skb_shinfo(skb)->gso_size) 3471 sta->tx_stats.msdu[tid] += 3472 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3473 else 3474 sta->tx_stats.msdu[tid]++; 3475 3476 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3477 3478 /* statistics normally done by ieee80211_tx_h_stats (but that 3479 * has to consider fragmentation, so is more complex) 3480 */ 3481 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3482 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3483 3484 if (pn_offs) { 3485 u64 pn; 3486 u8 *crypto_hdr = skb->data + pn_offs; 3487 3488 switch (key->conf.cipher) { 3489 case WLAN_CIPHER_SUITE_CCMP: 3490 case WLAN_CIPHER_SUITE_CCMP_256: 3491 case WLAN_CIPHER_SUITE_GCMP: 3492 case WLAN_CIPHER_SUITE_GCMP_256: 3493 pn = atomic64_inc_return(&key->conf.tx_pn); 3494 crypto_hdr[0] = pn; 3495 crypto_hdr[1] = pn >> 8; 3496 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3497 crypto_hdr[4] = pn >> 16; 3498 crypto_hdr[5] = pn >> 24; 3499 crypto_hdr[6] = pn >> 32; 3500 crypto_hdr[7] = pn >> 40; 3501 break; 3502 } 3503 } 3504 3505 return TX_CONTINUE; 3506 } 3507 ieee80211_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3508 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3509 struct sta_info *sta, 3510 struct ieee80211_fast_tx *fast_tx, 3511 struct sk_buff *skb) 3512 { 3513 struct ieee80211_local *local = sdata->local; 3514 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3515 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3516 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3517 struct ethhdr eth; 3518 struct ieee80211_tx_info *info; 3519 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3520 struct ieee80211_tx_data tx; 3521 ieee80211_tx_result r; 3522 struct tid_ampdu_tx *tid_tx = NULL; 3523 u8 tid = IEEE80211_NUM_TIDS; 3524 3525 /* control port protocol needs a lot of special handling */ 3526 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3527 return false; 3528 3529 /* only RFC 1042 SNAP */ 3530 if (ethertype < ETH_P_802_3_MIN) 3531 return false; 3532 3533 /* don't handle TX status request here either */ 3534 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3535 return false; 3536 3537 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3538 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3539 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3540 if (tid_tx) { 3541 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3542 return false; 3543 if (tid_tx->timeout) 3544 tid_tx->last_tx = jiffies; 3545 } 3546 } 3547 3548 /* after this point (skb is modified) we cannot return false */ 3549 3550 if (skb_shared(skb)) { 3551 struct sk_buff *tmp_skb = skb; 3552 3553 skb = skb_clone(skb, GFP_ATOMIC); 3554 kfree_skb(tmp_skb); 3555 3556 if (!skb) 3557 return true; 3558 } 3559 3560 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3561 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3562 return true; 3563 3564 /* will not be crypto-handled beyond what we do here, so use false 3565 * as the may-encrypt argument for the resize to not account for 3566 * more room than we already have in 'extra_head' 3567 */ 3568 if (unlikely(ieee80211_skb_resize(sdata, skb, 3569 max_t(int, extra_head + hw_headroom - 3570 skb_headroom(skb), 0), 3571 ENCRYPT_NO))) { 3572 kfree_skb(skb); 3573 return true; 3574 } 3575 3576 memcpy(ð, skb->data, ETH_HLEN - 2); 3577 hdr = skb_push(skb, extra_head); 3578 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3579 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3580 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3581 3582 info = IEEE80211_SKB_CB(skb); 3583 memset(info, 0, sizeof(*info)); 3584 info->band = fast_tx->band; 3585 info->control.vif = &sdata->vif; 3586 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3587 IEEE80211_TX_CTL_DONTFRAG | 3588 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3589 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3590 3591 #ifdef CONFIG_MAC80211_DEBUGFS 3592 if (local->force_tx_status) 3593 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3594 #endif 3595 3596 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3597 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3598 *ieee80211_get_qos_ctl(hdr) = tid; 3599 } 3600 3601 __skb_queue_head_init(&tx.skbs); 3602 3603 tx.flags = IEEE80211_TX_UNICAST; 3604 tx.local = local; 3605 tx.sdata = sdata; 3606 tx.sta = sta; 3607 tx.key = fast_tx->key; 3608 3609 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3610 return true; 3611 3612 tx.skb = skb; 3613 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3614 fast_tx->key, &tx); 3615 tx.skb = NULL; 3616 if (r == TX_DROP) { 3617 kfree_skb(skb); 3618 return true; 3619 } 3620 3621 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3622 sdata = container_of(sdata->bss, 3623 struct ieee80211_sub_if_data, u.ap); 3624 3625 __skb_queue_tail(&tx.skbs, skb); 3626 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3627 return true; 3628 } 3629 ieee80211_tx_dequeue(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3630 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3631 struct ieee80211_txq *txq) 3632 { 3633 struct ieee80211_local *local = hw_to_local(hw); 3634 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3635 struct ieee80211_hdr *hdr; 3636 struct sk_buff *skb = NULL; 3637 struct fq *fq = &local->fq; 3638 struct fq_tin *tin = &txqi->tin; 3639 struct ieee80211_tx_info *info; 3640 struct ieee80211_tx_data tx; 3641 ieee80211_tx_result r; 3642 struct ieee80211_vif *vif = txq->vif; 3643 3644 WARN_ON_ONCE(softirq_count() == 0); 3645 3646 if (!ieee80211_txq_airtime_check(hw, txq)) 3647 return NULL; 3648 3649 begin: 3650 spin_lock_bh(&fq->lock); 3651 3652 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3653 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3654 goto out; 3655 3656 if (vif->txqs_stopped[txq->ac]) { 3657 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3658 goto out; 3659 } 3660 3661 /* Make sure fragments stay together. */ 3662 skb = __skb_dequeue(&txqi->frags); 3663 if (unlikely(skb)) { 3664 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3665 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3666 goto out; 3667 IEEE80211_SKB_CB(skb)->control.flags &= 3668 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3669 } else { 3670 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3671 } 3672 3673 if (!skb) 3674 goto out; 3675 3676 spin_unlock_bh(&fq->lock); 3677 3678 hdr = (struct ieee80211_hdr *)skb->data; 3679 info = IEEE80211_SKB_CB(skb); 3680 3681 memset(&tx, 0, sizeof(tx)); 3682 __skb_queue_head_init(&tx.skbs); 3683 tx.local = local; 3684 tx.skb = skb; 3685 tx.sdata = vif_to_sdata(info->control.vif); 3686 3687 if (txq->sta) { 3688 tx.sta = container_of(txq->sta, struct sta_info, sta); 3689 /* 3690 * Drop unicast frames to unauthorised stations unless they are 3691 * injected frames or EAPOL frames from the local station. 3692 */ 3693 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3694 ieee80211_is_data(hdr->frame_control) && 3695 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3696 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3697 !is_multicast_ether_addr(hdr->addr1) && 3698 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3699 (!(info->control.flags & 3700 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3701 !ether_addr_equal(tx.sdata->vif.addr, 3702 hdr->addr2)))) { 3703 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3704 ieee80211_free_txskb(&local->hw, skb); 3705 goto begin; 3706 } 3707 } 3708 3709 /* 3710 * The key can be removed while the packet was queued, so need to call 3711 * this here to get the current key. 3712 */ 3713 r = ieee80211_tx_h_select_key(&tx); 3714 if (r != TX_CONTINUE) { 3715 ieee80211_free_txskb(&local->hw, skb); 3716 goto begin; 3717 } 3718 3719 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3720 info->flags |= IEEE80211_TX_CTL_AMPDU; 3721 else 3722 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3723 3724 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3725 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3726 r = ieee80211_tx_h_rate_ctrl(&tx); 3727 if (r != TX_CONTINUE) { 3728 ieee80211_free_txskb(&local->hw, skb); 3729 goto begin; 3730 } 3731 } 3732 goto encap_out; 3733 } 3734 3735 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3736 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3737 sta); 3738 u8 pn_offs = 0; 3739 3740 if (tx.key && 3741 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3742 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3743 3744 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3745 tx.key, &tx); 3746 if (r != TX_CONTINUE) { 3747 ieee80211_free_txskb(&local->hw, skb); 3748 goto begin; 3749 } 3750 } else { 3751 if (invoke_tx_handlers_late(&tx)) 3752 goto begin; 3753 3754 skb = __skb_dequeue(&tx.skbs); 3755 3756 if (!skb_queue_empty(&tx.skbs)) { 3757 spin_lock_bh(&fq->lock); 3758 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3759 spin_unlock_bh(&fq->lock); 3760 } 3761 } 3762 3763 if (skb_has_frag_list(skb) && 3764 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3765 if (skb_linearize(skb)) { 3766 ieee80211_free_txskb(&local->hw, skb); 3767 goto begin; 3768 } 3769 } 3770 3771 switch (tx.sdata->vif.type) { 3772 case NL80211_IFTYPE_MONITOR: 3773 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3774 vif = &tx.sdata->vif; 3775 break; 3776 } 3777 tx.sdata = rcu_dereference(local->monitor_sdata); 3778 if (tx.sdata) { 3779 vif = &tx.sdata->vif; 3780 info->hw_queue = 3781 vif->hw_queue[skb_get_queue_mapping(skb)]; 3782 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3783 ieee80211_free_txskb(&local->hw, skb); 3784 goto begin; 3785 } else { 3786 vif = NULL; 3787 } 3788 break; 3789 case NL80211_IFTYPE_AP_VLAN: 3790 tx.sdata = container_of(tx.sdata->bss, 3791 struct ieee80211_sub_if_data, u.ap); 3792 fallthrough; 3793 default: 3794 vif = &tx.sdata->vif; 3795 break; 3796 } 3797 3798 encap_out: 3799 IEEE80211_SKB_CB(skb)->control.vif = vif; 3800 3801 if (vif && 3802 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3803 bool ampdu = txq->ac != IEEE80211_AC_VO; 3804 u32 airtime; 3805 3806 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3807 skb->len, ampdu); 3808 if (airtime) { 3809 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3810 ieee80211_sta_update_pending_airtime(local, tx.sta, 3811 txq->ac, 3812 airtime, 3813 false); 3814 } 3815 } 3816 3817 return skb; 3818 3819 out: 3820 spin_unlock_bh(&fq->lock); 3821 3822 return skb; 3823 } 3824 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3825 ieee80211_next_txq(struct ieee80211_hw * hw,u8 ac)3826 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3827 { 3828 struct ieee80211_local *local = hw_to_local(hw); 3829 struct airtime_sched_info *air_sched; 3830 u64 now = ktime_get_boottime_ns(); 3831 struct ieee80211_txq *ret = NULL; 3832 struct airtime_info *air_info; 3833 struct txq_info *txqi = NULL; 3834 struct rb_node *node; 3835 bool first = false; 3836 3837 air_sched = &local->airtime[ac]; 3838 spin_lock_bh(&air_sched->lock); 3839 3840 node = air_sched->schedule_pos; 3841 3842 begin: 3843 if (!node) { 3844 node = rb_first_cached(&air_sched->active_txqs); 3845 first = true; 3846 } else { 3847 node = rb_next(node); 3848 } 3849 3850 if (!node) 3851 goto out; 3852 3853 txqi = container_of(node, struct txq_info, schedule_order); 3854 air_info = to_airtime_info(&txqi->txq); 3855 3856 if (air_info->v_t > air_sched->v_t && 3857 (!first || !airtime_catchup_v_t(air_sched, air_info->v_t, now))) 3858 goto out; 3859 3860 if (!ieee80211_txq_airtime_check(hw, &txqi->txq)) { 3861 first = false; 3862 goto begin; 3863 } 3864 3865 air_sched->schedule_pos = node; 3866 air_sched->last_schedule_activity = now; 3867 ret = &txqi->txq; 3868 out: 3869 spin_unlock_bh(&air_sched->lock); 3870 return ret; 3871 } 3872 EXPORT_SYMBOL(ieee80211_next_txq); 3873 __ieee80211_insert_txq(struct rb_root_cached * root,struct txq_info * txqi)3874 static void __ieee80211_insert_txq(struct rb_root_cached *root, 3875 struct txq_info *txqi) 3876 { 3877 struct rb_node **new = &root->rb_root.rb_node; 3878 struct airtime_info *old_air, *new_air; 3879 struct rb_node *parent = NULL; 3880 struct txq_info *__txqi; 3881 bool leftmost = true; 3882 3883 while (*new) { 3884 parent = *new; 3885 __txqi = rb_entry(parent, struct txq_info, schedule_order); 3886 old_air = to_airtime_info(&__txqi->txq); 3887 new_air = to_airtime_info(&txqi->txq); 3888 3889 if (new_air->v_t <= old_air->v_t) { 3890 new = &parent->rb_left; 3891 } else { 3892 new = &parent->rb_right; 3893 leftmost = false; 3894 } 3895 } 3896 3897 rb_link_node(&txqi->schedule_order, parent, new); 3898 rb_insert_color_cached(&txqi->schedule_order, root, leftmost); 3899 } 3900 ieee80211_resort_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3901 void ieee80211_resort_txq(struct ieee80211_hw *hw, 3902 struct ieee80211_txq *txq) 3903 { 3904 struct airtime_info *air_info = to_airtime_info(txq); 3905 struct ieee80211_local *local = hw_to_local(hw); 3906 struct txq_info *txqi = to_txq_info(txq); 3907 struct airtime_sched_info *air_sched; 3908 3909 air_sched = &local->airtime[txq->ac]; 3910 3911 lockdep_assert_held(&air_sched->lock); 3912 3913 if (!RB_EMPTY_NODE(&txqi->schedule_order)) { 3914 struct airtime_info *a_prev = NULL, *a_next = NULL; 3915 struct txq_info *t_prev, *t_next; 3916 struct rb_node *n_prev, *n_next; 3917 3918 /* Erasing a node can cause an expensive rebalancing operation, 3919 * so we check the previous and next nodes first and only remove 3920 * and re-insert if the current node is not already in the 3921 * correct position. 3922 */ 3923 if ((n_prev = rb_prev(&txqi->schedule_order)) != NULL) { 3924 t_prev = container_of(n_prev, struct txq_info, 3925 schedule_order); 3926 a_prev = to_airtime_info(&t_prev->txq); 3927 } 3928 3929 if ((n_next = rb_next(&txqi->schedule_order)) != NULL) { 3930 t_next = container_of(n_next, struct txq_info, 3931 schedule_order); 3932 a_next = to_airtime_info(&t_next->txq); 3933 } 3934 3935 if ((!a_prev || a_prev->v_t <= air_info->v_t) && 3936 (!a_next || a_next->v_t > air_info->v_t)) 3937 return; 3938 3939 if (air_sched->schedule_pos == &txqi->schedule_order) 3940 air_sched->schedule_pos = n_prev; 3941 3942 rb_erase_cached(&txqi->schedule_order, 3943 &air_sched->active_txqs); 3944 RB_CLEAR_NODE(&txqi->schedule_order); 3945 __ieee80211_insert_txq(&air_sched->active_txqs, txqi); 3946 } 3947 } 3948 ieee80211_update_airtime_weight(struct ieee80211_local * local,struct airtime_sched_info * air_sched,u64 now,bool force)3949 void ieee80211_update_airtime_weight(struct ieee80211_local *local, 3950 struct airtime_sched_info *air_sched, 3951 u64 now, bool force) 3952 { 3953 struct airtime_info *air_info, *tmp; 3954 u64 weight_sum = 0; 3955 3956 if (unlikely(!now)) 3957 now = ktime_get_boottime_ns(); 3958 3959 lockdep_assert_held(&air_sched->lock); 3960 3961 if (!force && (air_sched->last_weight_update < 3962 now - AIRTIME_ACTIVE_DURATION)) 3963 return; 3964 3965 list_for_each_entry_safe(air_info, tmp, 3966 &air_sched->active_list, list) { 3967 if (airtime_is_active(air_info, now)) 3968 weight_sum += air_info->weight; 3969 else 3970 list_del_init(&air_info->list); 3971 } 3972 airtime_weight_sum_set(air_sched, weight_sum); 3973 air_sched->last_weight_update = now; 3974 } 3975 ieee80211_schedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3976 void ieee80211_schedule_txq(struct ieee80211_hw *hw, 3977 struct ieee80211_txq *txq) 3978 __acquires(txq_lock) __releases(txq_lock) 3979 { 3980 struct ieee80211_local *local = hw_to_local(hw); 3981 struct txq_info *txqi = to_txq_info(txq); 3982 struct airtime_sched_info *air_sched; 3983 u64 now = ktime_get_boottime_ns(); 3984 struct airtime_info *air_info; 3985 u8 ac = txq->ac; 3986 bool was_active; 3987 3988 air_sched = &local->airtime[ac]; 3989 air_info = to_airtime_info(txq); 3990 3991 spin_lock_bh(&air_sched->lock); 3992 was_active = airtime_is_active(air_info, now); 3993 airtime_set_active(air_sched, air_info, now); 3994 3995 if (!RB_EMPTY_NODE(&txqi->schedule_order)) 3996 goto out; 3997 3998 /* If the station has been inactive for a while, catch up its v_t so it 3999 * doesn't get indefinite priority; see comment above the definition of 4000 * AIRTIME_MAX_BEHIND. 4001 */ 4002 if ((!was_active && air_info->v_t < air_sched->v_t) || 4003 air_info->v_t < air_sched->v_t - AIRTIME_MAX_BEHIND) 4004 air_info->v_t = air_sched->v_t; 4005 4006 ieee80211_update_airtime_weight(local, air_sched, now, !was_active); 4007 __ieee80211_insert_txq(&air_sched->active_txqs, txqi); 4008 4009 out: 4010 spin_unlock_bh(&air_sched->lock); 4011 } 4012 EXPORT_SYMBOL(ieee80211_schedule_txq); 4013 __ieee80211_unschedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool purge)4014 static void __ieee80211_unschedule_txq(struct ieee80211_hw *hw, 4015 struct ieee80211_txq *txq, 4016 bool purge) 4017 { 4018 struct ieee80211_local *local = hw_to_local(hw); 4019 struct txq_info *txqi = to_txq_info(txq); 4020 struct airtime_sched_info *air_sched; 4021 struct airtime_info *air_info; 4022 4023 air_sched = &local->airtime[txq->ac]; 4024 air_info = to_airtime_info(&txqi->txq); 4025 4026 lockdep_assert_held(&air_sched->lock); 4027 4028 if (purge) { 4029 list_del_init(&air_info->list); 4030 ieee80211_update_airtime_weight(local, air_sched, 0, true); 4031 } 4032 4033 if (RB_EMPTY_NODE(&txqi->schedule_order)) 4034 return; 4035 4036 if (air_sched->schedule_pos == &txqi->schedule_order) 4037 air_sched->schedule_pos = rb_prev(&txqi->schedule_order); 4038 4039 if (!purge) 4040 airtime_set_active(air_sched, air_info, 4041 ktime_get_boottime_ns()); 4042 4043 rb_erase_cached(&txqi->schedule_order, 4044 &air_sched->active_txqs); 4045 RB_CLEAR_NODE(&txqi->schedule_order); 4046 } 4047 ieee80211_unschedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool purge)4048 void ieee80211_unschedule_txq(struct ieee80211_hw *hw, 4049 struct ieee80211_txq *txq, 4050 bool purge) 4051 __acquires(txq_lock) __releases(txq_lock) 4052 { 4053 struct ieee80211_local *local = hw_to_local(hw); 4054 4055 spin_lock_bh(&local->airtime[txq->ac].lock); 4056 __ieee80211_unschedule_txq(hw, txq, purge); 4057 spin_unlock_bh(&local->airtime[txq->ac].lock); 4058 } 4059 ieee80211_return_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool force)4060 void ieee80211_return_txq(struct ieee80211_hw *hw, 4061 struct ieee80211_txq *txq, bool force) 4062 { 4063 struct ieee80211_local *local = hw_to_local(hw); 4064 struct txq_info *txqi = to_txq_info(txq); 4065 4066 spin_lock_bh(&local->airtime[txq->ac].lock); 4067 4068 if (!RB_EMPTY_NODE(&txqi->schedule_order) && !force && 4069 !txq_has_queue(txq)) 4070 __ieee80211_unschedule_txq(hw, txq, false); 4071 4072 spin_unlock_bh(&local->airtime[txq->ac].lock); 4073 } 4074 EXPORT_SYMBOL(ieee80211_return_txq); 4075 4076 DEFINE_STATIC_KEY_FALSE(aql_disable); 4077 ieee80211_txq_airtime_check(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4078 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4079 struct ieee80211_txq *txq) 4080 { 4081 struct airtime_info *air_info = to_airtime_info(txq); 4082 struct ieee80211_local *local = hw_to_local(hw); 4083 4084 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4085 return true; 4086 4087 if (static_branch_unlikely(&aql_disable)) 4088 return true; 4089 4090 if (!txq->sta) 4091 return true; 4092 4093 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4094 return true; 4095 4096 if (atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_low) 4097 return true; 4098 4099 if (atomic_read(&local->aql_total_pending_airtime) < 4100 local->aql_threshold && 4101 atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_high) 4102 return true; 4103 4104 return false; 4105 } 4106 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4107 ieee80211_txq_may_transmit(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4108 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4109 struct ieee80211_txq *txq) 4110 { 4111 struct txq_info *first_txqi = NULL, *txqi = to_txq_info(txq); 4112 struct ieee80211_local *local = hw_to_local(hw); 4113 struct airtime_sched_info *air_sched; 4114 struct airtime_info *air_info; 4115 struct rb_node *node = NULL; 4116 bool ret = false; 4117 u64 now; 4118 4119 4120 if (!ieee80211_txq_airtime_check(hw, txq)) 4121 return false; 4122 4123 air_sched = &local->airtime[txq->ac]; 4124 spin_lock_bh(&air_sched->lock); 4125 4126 if (RB_EMPTY_NODE(&txqi->schedule_order)) 4127 goto out; 4128 4129 now = ktime_get_boottime_ns(); 4130 4131 /* Like in ieee80211_next_txq(), make sure the first station in the 4132 * scheduling order is eligible for transmission to avoid starvation. 4133 */ 4134 node = rb_first_cached(&air_sched->active_txqs); 4135 if (node) { 4136 first_txqi = container_of(node, struct txq_info, 4137 schedule_order); 4138 air_info = to_airtime_info(&first_txqi->txq); 4139 4140 if (air_sched->v_t < air_info->v_t) 4141 airtime_catchup_v_t(air_sched, air_info->v_t, now); 4142 } 4143 4144 air_info = to_airtime_info(&txqi->txq); 4145 if (air_info->v_t <= air_sched->v_t) { 4146 air_sched->last_schedule_activity = now; 4147 ret = true; 4148 } 4149 4150 out: 4151 spin_unlock_bh(&air_sched->lock); 4152 return ret; 4153 } 4154 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4155 ieee80211_txq_schedule_start(struct ieee80211_hw * hw,u8 ac)4156 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4157 { 4158 struct ieee80211_local *local = hw_to_local(hw); 4159 struct airtime_sched_info *air_sched = &local->airtime[ac]; 4160 4161 spin_lock_bh(&air_sched->lock); 4162 air_sched->schedule_pos = NULL; 4163 spin_unlock_bh(&air_sched->lock); 4164 } 4165 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4166 __ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev,u32 info_flags,u32 ctrl_flags,u64 * cookie)4167 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4168 struct net_device *dev, 4169 u32 info_flags, 4170 u32 ctrl_flags, 4171 u64 *cookie) 4172 { 4173 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4174 struct ieee80211_local *local = sdata->local; 4175 struct sta_info *sta; 4176 struct sk_buff *next; 4177 4178 if (unlikely(skb->len < ETH_HLEN)) { 4179 kfree_skb(skb); 4180 return; 4181 } 4182 4183 rcu_read_lock(); 4184 4185 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4186 goto out_free; 4187 4188 if (IS_ERR(sta)) 4189 sta = NULL; 4190 4191 if (local->ops->wake_tx_queue) { 4192 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4193 skb_set_queue_mapping(skb, queue); 4194 skb_get_hash(skb); 4195 } 4196 4197 ieee80211_aggr_check(sdata, sta, skb); 4198 4199 if (sta) { 4200 struct ieee80211_fast_tx *fast_tx; 4201 4202 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4203 4204 fast_tx = rcu_dereference(sta->fast_tx); 4205 4206 if (fast_tx && 4207 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4208 goto out; 4209 } 4210 4211 if (skb_is_gso(skb)) { 4212 struct sk_buff *segs; 4213 4214 segs = skb_gso_segment(skb, 0); 4215 if (IS_ERR(segs)) { 4216 goto out_free; 4217 } else if (segs) { 4218 consume_skb(skb); 4219 skb = segs; 4220 } 4221 } else { 4222 /* we cannot process non-linear frames on this path */ 4223 if (skb_linearize(skb)) { 4224 kfree_skb(skb); 4225 goto out; 4226 } 4227 4228 /* the frame could be fragmented, software-encrypted, and other 4229 * things so we cannot really handle checksum offload with it - 4230 * fix it up in software before we handle anything else. 4231 */ 4232 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4233 skb_set_transport_header(skb, 4234 skb_checksum_start_offset(skb)); 4235 if (skb_checksum_help(skb)) 4236 goto out_free; 4237 } 4238 } 4239 4240 skb_list_walk_safe(skb, skb, next) { 4241 skb_mark_not_on_list(skb); 4242 4243 if (skb->protocol == sdata->control_port_protocol) 4244 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4245 4246 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4247 sta, ctrl_flags, cookie); 4248 if (IS_ERR(skb)) { 4249 kfree_skb_list(next); 4250 goto out; 4251 } 4252 4253 dev_sw_netstats_tx_add(dev, 1, skb->len); 4254 4255 ieee80211_xmit(sdata, sta, skb); 4256 } 4257 goto out; 4258 out_free: 4259 kfree_skb(skb); 4260 out: 4261 rcu_read_unlock(); 4262 } 4263 ieee80211_change_da(struct sk_buff * skb,struct sta_info * sta)4264 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4265 { 4266 struct ethhdr *eth; 4267 int err; 4268 4269 err = skb_ensure_writable(skb, ETH_HLEN); 4270 if (unlikely(err)) 4271 return err; 4272 4273 eth = (void *)skb->data; 4274 ether_addr_copy(eth->h_dest, sta->sta.addr); 4275 4276 return 0; 4277 } 4278 ieee80211_multicast_to_unicast(struct sk_buff * skb,struct net_device * dev)4279 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4280 struct net_device *dev) 4281 { 4282 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4283 const struct ethhdr *eth = (void *)skb->data; 4284 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4285 __be16 ethertype; 4286 4287 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4288 return false; 4289 4290 switch (sdata->vif.type) { 4291 case NL80211_IFTYPE_AP_VLAN: 4292 if (sdata->u.vlan.sta) 4293 return false; 4294 if (sdata->wdev.use_4addr) 4295 return false; 4296 fallthrough; 4297 case NL80211_IFTYPE_AP: 4298 /* check runtime toggle for this bss */ 4299 if (!sdata->bss->multicast_to_unicast) 4300 return false; 4301 break; 4302 default: 4303 return false; 4304 } 4305 4306 /* multicast to unicast conversion only for some payload */ 4307 ethertype = eth->h_proto; 4308 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4309 ethertype = ethvlan->h_vlan_encapsulated_proto; 4310 switch (ethertype) { 4311 case htons(ETH_P_ARP): 4312 case htons(ETH_P_IP): 4313 case htons(ETH_P_IPV6): 4314 break; 4315 default: 4316 return false; 4317 } 4318 4319 return true; 4320 } 4321 4322 static void ieee80211_convert_to_unicast(struct sk_buff * skb,struct net_device * dev,struct sk_buff_head * queue)4323 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4324 struct sk_buff_head *queue) 4325 { 4326 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4327 struct ieee80211_local *local = sdata->local; 4328 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4329 struct sta_info *sta, *first = NULL; 4330 struct sk_buff *cloned_skb; 4331 4332 rcu_read_lock(); 4333 4334 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4335 if (sdata != sta->sdata) 4336 /* AP-VLAN mismatch */ 4337 continue; 4338 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4339 /* do not send back to source */ 4340 continue; 4341 if (!first) { 4342 first = sta; 4343 continue; 4344 } 4345 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4346 if (!cloned_skb) 4347 goto multicast; 4348 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4349 dev_kfree_skb(cloned_skb); 4350 goto multicast; 4351 } 4352 __skb_queue_tail(queue, cloned_skb); 4353 } 4354 4355 if (likely(first)) { 4356 if (unlikely(ieee80211_change_da(skb, first))) 4357 goto multicast; 4358 __skb_queue_tail(queue, skb); 4359 } else { 4360 /* no STA connected, drop */ 4361 kfree_skb(skb); 4362 skb = NULL; 4363 } 4364 4365 goto out; 4366 multicast: 4367 __skb_queue_purge(queue); 4368 __skb_queue_tail(queue, skb); 4369 out: 4370 rcu_read_unlock(); 4371 } 4372 4373 /** 4374 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4375 * @skb: packet to be sent 4376 * @dev: incoming interface 4377 * 4378 * On failure skb will be freed. 4379 */ ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev)4380 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4381 struct net_device *dev) 4382 { 4383 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4384 struct sk_buff_head queue; 4385 4386 __skb_queue_head_init(&queue); 4387 ieee80211_convert_to_unicast(skb, dev, &queue); 4388 while ((skb = __skb_dequeue(&queue))) 4389 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4390 } else { 4391 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4392 } 4393 4394 return NETDEV_TX_OK; 4395 } 4396 ieee80211_tx_8023(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int led_len,struct sta_info * sta,bool txpending)4397 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4398 struct sk_buff *skb, int led_len, 4399 struct sta_info *sta, 4400 bool txpending) 4401 { 4402 struct ieee80211_local *local = sdata->local; 4403 struct ieee80211_tx_control control = {}; 4404 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4405 struct ieee80211_sta *pubsta = NULL; 4406 unsigned long flags; 4407 int q = info->hw_queue; 4408 4409 if (sta) 4410 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4411 4412 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4413 return true; 4414 4415 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4416 4417 if (local->queue_stop_reasons[q] || 4418 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4419 if (txpending) 4420 skb_queue_head(&local->pending[q], skb); 4421 else 4422 skb_queue_tail(&local->pending[q], skb); 4423 4424 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4425 4426 return false; 4427 } 4428 4429 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4430 4431 if (sta && sta->uploaded) 4432 pubsta = &sta->sta; 4433 4434 control.sta = pubsta; 4435 4436 drv_tx(local, &control, skb); 4437 4438 return true; 4439 } 4440 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)4441 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4442 struct net_device *dev, struct sta_info *sta, 4443 struct ieee80211_key *key, struct sk_buff *skb) 4444 { 4445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4446 struct ieee80211_local *local = sdata->local; 4447 struct tid_ampdu_tx *tid_tx; 4448 u8 tid; 4449 4450 if (local->ops->wake_tx_queue) { 4451 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4452 skb_set_queue_mapping(skb, queue); 4453 skb_get_hash(skb); 4454 } 4455 4456 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4457 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4458 goto out_free; 4459 4460 memset(info, 0, sizeof(*info)); 4461 4462 ieee80211_aggr_check(sdata, sta, skb); 4463 4464 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4465 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4466 if (tid_tx) { 4467 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4468 /* fall back to non-offload slow path */ 4469 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4470 return; 4471 } 4472 4473 info->flags |= IEEE80211_TX_CTL_AMPDU; 4474 if (tid_tx->timeout) 4475 tid_tx->last_tx = jiffies; 4476 } 4477 4478 if (unlikely(skb->sk && 4479 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4480 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4481 &info->flags, NULL); 4482 4483 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4484 4485 dev_sw_netstats_tx_add(dev, 1, skb->len); 4486 4487 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4488 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4489 4490 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4491 sdata = container_of(sdata->bss, 4492 struct ieee80211_sub_if_data, u.ap); 4493 4494 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4495 info->control.vif = &sdata->vif; 4496 4497 if (key) 4498 info->control.hw_key = &key->conf; 4499 4500 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4501 4502 return; 4503 4504 out_free: 4505 kfree_skb(skb); 4506 } 4507 ieee80211_subif_start_xmit_8023(struct sk_buff * skb,struct net_device * dev)4508 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4509 struct net_device *dev) 4510 { 4511 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4512 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4513 struct ieee80211_key *key; 4514 struct sta_info *sta; 4515 4516 if (unlikely(skb->len < ETH_HLEN)) { 4517 kfree_skb(skb); 4518 return NETDEV_TX_OK; 4519 } 4520 4521 rcu_read_lock(); 4522 4523 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4524 kfree_skb(skb); 4525 goto out; 4526 } 4527 4528 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4529 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4530 sdata->control_port_protocol == ehdr->h_proto)) 4531 goto skip_offload; 4532 4533 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4534 if (!key) 4535 key = rcu_dereference(sdata->default_unicast_key); 4536 4537 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4538 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4539 goto skip_offload; 4540 4541 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4542 goto out; 4543 4544 skip_offload: 4545 ieee80211_subif_start_xmit(skb, dev); 4546 out: 4547 rcu_read_unlock(); 4548 4549 return NETDEV_TX_OK; 4550 } 4551 4552 struct sk_buff * ieee80211_build_data_template(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags)4553 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4554 struct sk_buff *skb, u32 info_flags) 4555 { 4556 struct ieee80211_hdr *hdr; 4557 struct ieee80211_tx_data tx = { 4558 .local = sdata->local, 4559 .sdata = sdata, 4560 }; 4561 struct sta_info *sta; 4562 4563 rcu_read_lock(); 4564 4565 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4566 kfree_skb(skb); 4567 skb = ERR_PTR(-EINVAL); 4568 goto out; 4569 } 4570 4571 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4572 if (IS_ERR(skb)) 4573 goto out; 4574 4575 hdr = (void *)skb->data; 4576 tx.sta = sta_info_get(sdata, hdr->addr1); 4577 tx.skb = skb; 4578 4579 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4580 rcu_read_unlock(); 4581 kfree_skb(skb); 4582 return ERR_PTR(-EINVAL); 4583 } 4584 4585 out: 4586 rcu_read_unlock(); 4587 return skb; 4588 } 4589 4590 /* 4591 * ieee80211_clear_tx_pending may not be called in a context where 4592 * it is possible that it packets could come in again. 4593 */ ieee80211_clear_tx_pending(struct ieee80211_local * local)4594 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4595 { 4596 struct sk_buff *skb; 4597 int i; 4598 4599 for (i = 0; i < local->hw.queues; i++) { 4600 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4601 ieee80211_free_txskb(&local->hw, skb); 4602 } 4603 } 4604 4605 /* 4606 * Returns false if the frame couldn't be transmitted but was queued instead, 4607 * which in this case means re-queued -- take as an indication to stop sending 4608 * more pending frames. 4609 */ ieee80211_tx_pending_skb(struct ieee80211_local * local,struct sk_buff * skb)4610 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4611 struct sk_buff *skb) 4612 { 4613 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4614 struct ieee80211_sub_if_data *sdata; 4615 struct sta_info *sta; 4616 struct ieee80211_hdr *hdr; 4617 bool result; 4618 struct ieee80211_chanctx_conf *chanctx_conf; 4619 4620 sdata = vif_to_sdata(info->control.vif); 4621 4622 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4623 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4624 if (unlikely(!chanctx_conf)) { 4625 dev_kfree_skb(skb); 4626 return true; 4627 } 4628 info->band = chanctx_conf->def.chan->band; 4629 result = ieee80211_tx(sdata, NULL, skb, true); 4630 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4631 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4632 dev_kfree_skb(skb); 4633 return true; 4634 } 4635 4636 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4637 sta = NULL; 4638 4639 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4640 } else { 4641 struct sk_buff_head skbs; 4642 4643 __skb_queue_head_init(&skbs); 4644 __skb_queue_tail(&skbs, skb); 4645 4646 hdr = (struct ieee80211_hdr *)skb->data; 4647 sta = sta_info_get(sdata, hdr->addr1); 4648 4649 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4650 } 4651 4652 return result; 4653 } 4654 4655 /* 4656 * Transmit all pending packets. Called from tasklet. 4657 */ ieee80211_tx_pending(struct tasklet_struct * t)4658 void ieee80211_tx_pending(struct tasklet_struct *t) 4659 { 4660 struct ieee80211_local *local = from_tasklet(local, t, 4661 tx_pending_tasklet); 4662 unsigned long flags; 4663 int i; 4664 bool txok; 4665 4666 rcu_read_lock(); 4667 4668 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4669 for (i = 0; i < local->hw.queues; i++) { 4670 /* 4671 * If queue is stopped by something other than due to pending 4672 * frames, or we have no pending frames, proceed to next queue. 4673 */ 4674 if (local->queue_stop_reasons[i] || 4675 skb_queue_empty(&local->pending[i])) 4676 continue; 4677 4678 while (!skb_queue_empty(&local->pending[i])) { 4679 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4680 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4681 4682 if (WARN_ON(!info->control.vif)) { 4683 ieee80211_free_txskb(&local->hw, skb); 4684 continue; 4685 } 4686 4687 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4688 flags); 4689 4690 txok = ieee80211_tx_pending_skb(local, skb); 4691 spin_lock_irqsave(&local->queue_stop_reason_lock, 4692 flags); 4693 if (!txok) 4694 break; 4695 } 4696 4697 if (skb_queue_empty(&local->pending[i])) 4698 ieee80211_propagate_queue_wake(local, i); 4699 } 4700 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4701 4702 rcu_read_unlock(); 4703 } 4704 4705 /* functions for drivers to get certain frames */ 4706 __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ps_data * ps,struct sk_buff * skb,bool is_template)4707 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4708 struct ps_data *ps, struct sk_buff *skb, 4709 bool is_template) 4710 { 4711 u8 *pos, *tim; 4712 int aid0 = 0; 4713 int i, have_bits = 0, n1, n2; 4714 4715 /* Generate bitmap for TIM only if there are any STAs in power save 4716 * mode. */ 4717 if (atomic_read(&ps->num_sta_ps) > 0) 4718 /* in the hope that this is faster than 4719 * checking byte-for-byte */ 4720 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4721 IEEE80211_MAX_AID+1); 4722 if (!is_template) { 4723 if (ps->dtim_count == 0) 4724 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4725 else 4726 ps->dtim_count--; 4727 } 4728 4729 tim = pos = skb_put(skb, 6); 4730 *pos++ = WLAN_EID_TIM; 4731 *pos++ = 4; 4732 *pos++ = ps->dtim_count; 4733 *pos++ = sdata->vif.bss_conf.dtim_period; 4734 4735 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4736 aid0 = 1; 4737 4738 ps->dtim_bc_mc = aid0 == 1; 4739 4740 if (have_bits) { 4741 /* Find largest even number N1 so that bits numbered 1 through 4742 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4743 * (N2 + 1) x 8 through 2007 are 0. */ 4744 n1 = 0; 4745 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4746 if (ps->tim[i]) { 4747 n1 = i & 0xfe; 4748 break; 4749 } 4750 } 4751 n2 = n1; 4752 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4753 if (ps->tim[i]) { 4754 n2 = i; 4755 break; 4756 } 4757 } 4758 4759 /* Bitmap control */ 4760 *pos++ = n1 | aid0; 4761 /* Part Virt Bitmap */ 4762 skb_put(skb, n2 - n1); 4763 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4764 4765 tim[1] = n2 - n1 + 4; 4766 } else { 4767 *pos++ = aid0; /* Bitmap control */ 4768 *pos++ = 0; /* Part Virt Bitmap */ 4769 } 4770 } 4771 ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ps_data * ps,struct sk_buff * skb,bool is_template)4772 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4773 struct ps_data *ps, struct sk_buff *skb, 4774 bool is_template) 4775 { 4776 struct ieee80211_local *local = sdata->local; 4777 4778 /* 4779 * Not very nice, but we want to allow the driver to call 4780 * ieee80211_beacon_get() as a response to the set_tim() 4781 * callback. That, however, is already invoked under the 4782 * sta_lock to guarantee consistent and race-free update 4783 * of the tim bitmap in mac80211 and the driver. 4784 */ 4785 if (local->tim_in_locked_section) { 4786 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4787 } else { 4788 spin_lock_bh(&local->tim_lock); 4789 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4790 spin_unlock_bh(&local->tim_lock); 4791 } 4792 4793 return 0; 4794 } 4795 ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data * sdata,struct beacon_data * beacon)4796 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4797 struct beacon_data *beacon) 4798 { 4799 u8 *beacon_data, count, max_count = 1; 4800 struct probe_resp *resp; 4801 size_t beacon_data_len; 4802 u16 *bcn_offsets; 4803 int i; 4804 4805 switch (sdata->vif.type) { 4806 case NL80211_IFTYPE_AP: 4807 beacon_data = beacon->tail; 4808 beacon_data_len = beacon->tail_len; 4809 break; 4810 case NL80211_IFTYPE_ADHOC: 4811 beacon_data = beacon->head; 4812 beacon_data_len = beacon->head_len; 4813 break; 4814 case NL80211_IFTYPE_MESH_POINT: 4815 beacon_data = beacon->head; 4816 beacon_data_len = beacon->head_len; 4817 break; 4818 default: 4819 return; 4820 } 4821 4822 rcu_read_lock(); 4823 resp = rcu_dereference(sdata->u.ap.probe_resp); 4824 4825 bcn_offsets = beacon->cntdwn_counter_offsets; 4826 count = beacon->cntdwn_current_counter; 4827 if (sdata->vif.csa_active) 4828 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4829 4830 for (i = 0; i < max_count; ++i) { 4831 if (bcn_offsets[i]) { 4832 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) { 4833 rcu_read_unlock(); 4834 return; 4835 } 4836 beacon_data[bcn_offsets[i]] = count; 4837 } 4838 4839 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 4840 u16 *resp_offsets = resp->cntdwn_counter_offsets; 4841 4842 resp->data[resp_offsets[i]] = count; 4843 } 4844 } 4845 rcu_read_unlock(); 4846 } 4847 __ieee80211_beacon_update_cntdwn(struct beacon_data * beacon)4848 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4849 { 4850 beacon->cntdwn_current_counter--; 4851 4852 /* the counter should never reach 0 */ 4853 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4854 4855 return beacon->cntdwn_current_counter; 4856 } 4857 ieee80211_beacon_update_cntdwn(struct ieee80211_vif * vif)4858 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4859 { 4860 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4861 struct beacon_data *beacon = NULL; 4862 u8 count = 0; 4863 4864 rcu_read_lock(); 4865 4866 if (sdata->vif.type == NL80211_IFTYPE_AP) 4867 beacon = rcu_dereference(sdata->u.ap.beacon); 4868 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4869 beacon = rcu_dereference(sdata->u.ibss.presp); 4870 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4871 beacon = rcu_dereference(sdata->u.mesh.beacon); 4872 4873 if (!beacon) 4874 goto unlock; 4875 4876 count = __ieee80211_beacon_update_cntdwn(beacon); 4877 4878 unlock: 4879 rcu_read_unlock(); 4880 return count; 4881 } 4882 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4883 ieee80211_beacon_set_cntdwn(struct ieee80211_vif * vif,u8 counter)4884 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4885 { 4886 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4887 struct beacon_data *beacon = NULL; 4888 4889 rcu_read_lock(); 4890 4891 if (sdata->vif.type == NL80211_IFTYPE_AP) 4892 beacon = rcu_dereference(sdata->u.ap.beacon); 4893 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4894 beacon = rcu_dereference(sdata->u.ibss.presp); 4895 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4896 beacon = rcu_dereference(sdata->u.mesh.beacon); 4897 4898 if (!beacon) 4899 goto unlock; 4900 4901 if (counter < beacon->cntdwn_current_counter) 4902 beacon->cntdwn_current_counter = counter; 4903 4904 unlock: 4905 rcu_read_unlock(); 4906 } 4907 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4908 ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif * vif)4909 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4910 { 4911 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4912 struct beacon_data *beacon = NULL; 4913 u8 *beacon_data; 4914 size_t beacon_data_len; 4915 int ret = false; 4916 4917 if (!ieee80211_sdata_running(sdata)) 4918 return false; 4919 4920 rcu_read_lock(); 4921 if (vif->type == NL80211_IFTYPE_AP) { 4922 struct ieee80211_if_ap *ap = &sdata->u.ap; 4923 4924 beacon = rcu_dereference(ap->beacon); 4925 if (WARN_ON(!beacon || !beacon->tail)) 4926 goto out; 4927 beacon_data = beacon->tail; 4928 beacon_data_len = beacon->tail_len; 4929 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4930 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4931 4932 beacon = rcu_dereference(ifibss->presp); 4933 if (!beacon) 4934 goto out; 4935 4936 beacon_data = beacon->head; 4937 beacon_data_len = beacon->head_len; 4938 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4939 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4940 4941 beacon = rcu_dereference(ifmsh->beacon); 4942 if (!beacon) 4943 goto out; 4944 4945 beacon_data = beacon->head; 4946 beacon_data_len = beacon->head_len; 4947 } else { 4948 WARN_ON(1); 4949 goto out; 4950 } 4951 4952 if (!beacon->cntdwn_counter_offsets[0]) 4953 goto out; 4954 4955 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4956 goto out; 4957 4958 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4959 ret = true; 4960 4961 out: 4962 rcu_read_unlock(); 4963 4964 return ret; 4965 } 4966 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4967 ieee80211_beacon_protect(struct sk_buff * skb,struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)4968 static int ieee80211_beacon_protect(struct sk_buff *skb, 4969 struct ieee80211_local *local, 4970 struct ieee80211_sub_if_data *sdata) 4971 { 4972 ieee80211_tx_result res; 4973 struct ieee80211_tx_data tx; 4974 struct sk_buff *check_skb; 4975 4976 memset(&tx, 0, sizeof(tx)); 4977 tx.key = rcu_dereference(sdata->default_beacon_key); 4978 if (!tx.key) 4979 return 0; 4980 tx.local = local; 4981 tx.sdata = sdata; 4982 __skb_queue_head_init(&tx.skbs); 4983 __skb_queue_tail(&tx.skbs, skb); 4984 res = ieee80211_tx_h_encrypt(&tx); 4985 check_skb = __skb_dequeue(&tx.skbs); 4986 /* we may crash after this, but it'd be a bug in crypto */ 4987 WARN_ON(check_skb != skb); 4988 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4989 return -EINVAL; 4990 4991 return 0; 4992 } 4993 4994 static struct sk_buff * __ieee80211_beacon_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,bool is_template)4995 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4996 struct ieee80211_vif *vif, 4997 struct ieee80211_mutable_offsets *offs, 4998 bool is_template) 4999 { 5000 struct ieee80211_local *local = hw_to_local(hw); 5001 struct beacon_data *beacon = NULL; 5002 struct sk_buff *skb = NULL; 5003 struct ieee80211_tx_info *info; 5004 struct ieee80211_sub_if_data *sdata = NULL; 5005 enum nl80211_band band; 5006 struct ieee80211_tx_rate_control txrc; 5007 struct ieee80211_chanctx_conf *chanctx_conf; 5008 int csa_off_base = 0; 5009 5010 rcu_read_lock(); 5011 5012 sdata = vif_to_sdata(vif); 5013 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5014 5015 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5016 goto out; 5017 5018 if (offs) 5019 memset(offs, 0, sizeof(*offs)); 5020 5021 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5022 struct ieee80211_if_ap *ap = &sdata->u.ap; 5023 5024 beacon = rcu_dereference(ap->beacon); 5025 if (beacon) { 5026 if (beacon->cntdwn_counter_offsets[0]) { 5027 if (!is_template) 5028 ieee80211_beacon_update_cntdwn(vif); 5029 5030 ieee80211_set_beacon_cntdwn(sdata, beacon); 5031 } 5032 5033 /* 5034 * headroom, head length, 5035 * tail length and maximum TIM length 5036 */ 5037 skb = dev_alloc_skb(local->tx_headroom + 5038 beacon->head_len + 5039 beacon->tail_len + 256 + 5040 local->hw.extra_beacon_tailroom); 5041 if (!skb) 5042 goto out; 5043 5044 skb_reserve(skb, local->tx_headroom); 5045 skb_put_data(skb, beacon->head, beacon->head_len); 5046 5047 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 5048 is_template); 5049 5050 if (offs) { 5051 offs->tim_offset = beacon->head_len; 5052 offs->tim_length = skb->len - beacon->head_len; 5053 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5054 5055 /* for AP the csa offsets are from tail */ 5056 csa_off_base = skb->len; 5057 } 5058 5059 if (beacon->tail) 5060 skb_put_data(skb, beacon->tail, 5061 beacon->tail_len); 5062 5063 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 5064 goto out; 5065 } else 5066 goto out; 5067 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5068 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5069 struct ieee80211_hdr *hdr; 5070 5071 beacon = rcu_dereference(ifibss->presp); 5072 if (!beacon) 5073 goto out; 5074 5075 if (beacon->cntdwn_counter_offsets[0]) { 5076 if (!is_template) 5077 __ieee80211_beacon_update_cntdwn(beacon); 5078 5079 ieee80211_set_beacon_cntdwn(sdata, beacon); 5080 } 5081 5082 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5083 local->hw.extra_beacon_tailroom); 5084 if (!skb) 5085 goto out; 5086 skb_reserve(skb, local->tx_headroom); 5087 skb_put_data(skb, beacon->head, beacon->head_len); 5088 5089 hdr = (struct ieee80211_hdr *) skb->data; 5090 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5091 IEEE80211_STYPE_BEACON); 5092 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5093 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5094 5095 beacon = rcu_dereference(ifmsh->beacon); 5096 if (!beacon) 5097 goto out; 5098 5099 if (beacon->cntdwn_counter_offsets[0]) { 5100 if (!is_template) 5101 /* TODO: For mesh csa_counter is in TU, so 5102 * decrementing it by one isn't correct, but 5103 * for now we leave it consistent with overall 5104 * mac80211's behavior. 5105 */ 5106 __ieee80211_beacon_update_cntdwn(beacon); 5107 5108 ieee80211_set_beacon_cntdwn(sdata, beacon); 5109 } 5110 5111 if (ifmsh->sync_ops) 5112 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5113 5114 skb = dev_alloc_skb(local->tx_headroom + 5115 beacon->head_len + 5116 256 + /* TIM IE */ 5117 beacon->tail_len + 5118 local->hw.extra_beacon_tailroom); 5119 if (!skb) 5120 goto out; 5121 skb_reserve(skb, local->tx_headroom); 5122 skb_put_data(skb, beacon->head, beacon->head_len); 5123 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 5124 5125 if (offs) { 5126 offs->tim_offset = beacon->head_len; 5127 offs->tim_length = skb->len - beacon->head_len; 5128 } 5129 5130 skb_put_data(skb, beacon->tail, beacon->tail_len); 5131 } else { 5132 WARN_ON(1); 5133 goto out; 5134 } 5135 5136 /* CSA offsets */ 5137 if (offs && beacon) { 5138 int i; 5139 5140 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5141 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5142 5143 if (!csa_off) 5144 continue; 5145 5146 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5147 } 5148 } 5149 5150 band = chanctx_conf->def.chan->band; 5151 5152 info = IEEE80211_SKB_CB(skb); 5153 5154 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5155 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5156 info->band = band; 5157 5158 memset(&txrc, 0, sizeof(txrc)); 5159 txrc.hw = hw; 5160 txrc.sband = local->hw.wiphy->bands[band]; 5161 txrc.bss_conf = &sdata->vif.bss_conf; 5162 txrc.skb = skb; 5163 txrc.reported_rate.idx = -1; 5164 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5165 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5166 else 5167 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5168 txrc.bss = true; 5169 rate_control_get_rate(sdata, NULL, &txrc); 5170 5171 info->control.vif = vif; 5172 5173 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5174 IEEE80211_TX_CTL_ASSIGN_SEQ | 5175 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5176 out: 5177 rcu_read_unlock(); 5178 return skb; 5179 5180 } 5181 5182 struct sk_buff * ieee80211_beacon_get_template(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs)5183 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5184 struct ieee80211_vif *vif, 5185 struct ieee80211_mutable_offsets *offs) 5186 { 5187 return __ieee80211_beacon_get(hw, vif, offs, true); 5188 } 5189 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5190 ieee80211_beacon_get_tim(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u16 * tim_offset,u16 * tim_length)5191 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5192 struct ieee80211_vif *vif, 5193 u16 *tim_offset, u16 *tim_length) 5194 { 5195 struct ieee80211_mutable_offsets offs = {}; 5196 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 5197 struct sk_buff *copy; 5198 struct ieee80211_supported_band *sband; 5199 int shift; 5200 5201 if (!bcn) 5202 return bcn; 5203 5204 if (tim_offset) 5205 *tim_offset = offs.tim_offset; 5206 5207 if (tim_length) 5208 *tim_length = offs.tim_length; 5209 5210 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5211 !hw_to_local(hw)->monitors) 5212 return bcn; 5213 5214 /* send a copy to monitor interfaces */ 5215 copy = skb_copy(bcn, GFP_ATOMIC); 5216 if (!copy) 5217 return bcn; 5218 5219 shift = ieee80211_vif_get_shift(vif); 5220 sband = ieee80211_get_sband(vif_to_sdata(vif)); 5221 if (!sband) 5222 return bcn; 5223 5224 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 5225 NULL); 5226 5227 return bcn; 5228 } 5229 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5230 ieee80211_proberesp_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5231 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5232 struct ieee80211_vif *vif) 5233 { 5234 struct ieee80211_if_ap *ap = NULL; 5235 struct sk_buff *skb = NULL; 5236 struct probe_resp *presp = NULL; 5237 struct ieee80211_hdr *hdr; 5238 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5239 5240 if (sdata->vif.type != NL80211_IFTYPE_AP) 5241 return NULL; 5242 5243 rcu_read_lock(); 5244 5245 ap = &sdata->u.ap; 5246 presp = rcu_dereference(ap->probe_resp); 5247 if (!presp) 5248 goto out; 5249 5250 skb = dev_alloc_skb(presp->len); 5251 if (!skb) 5252 goto out; 5253 5254 skb_put_data(skb, presp->data, presp->len); 5255 5256 hdr = (struct ieee80211_hdr *) skb->data; 5257 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5258 5259 out: 5260 rcu_read_unlock(); 5261 return skb; 5262 } 5263 EXPORT_SYMBOL(ieee80211_proberesp_get); 5264 ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5265 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5266 struct ieee80211_vif *vif) 5267 { 5268 struct sk_buff *skb = NULL; 5269 struct fils_discovery_data *tmpl = NULL; 5270 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5271 5272 if (sdata->vif.type != NL80211_IFTYPE_AP) 5273 return NULL; 5274 5275 rcu_read_lock(); 5276 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5277 if (!tmpl) { 5278 rcu_read_unlock(); 5279 return NULL; 5280 } 5281 5282 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5283 if (skb) { 5284 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5285 skb_put_data(skb, tmpl->data, tmpl->len); 5286 } 5287 5288 rcu_read_unlock(); 5289 return skb; 5290 } 5291 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5292 5293 struct sk_buff * ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5294 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5295 struct ieee80211_vif *vif) 5296 { 5297 struct sk_buff *skb = NULL; 5298 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5299 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5300 5301 if (sdata->vif.type != NL80211_IFTYPE_AP) 5302 return NULL; 5303 5304 rcu_read_lock(); 5305 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5306 if (!tmpl) { 5307 rcu_read_unlock(); 5308 return NULL; 5309 } 5310 5311 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5312 if (skb) { 5313 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5314 skb_put_data(skb, tmpl->data, tmpl->len); 5315 } 5316 5317 rcu_read_unlock(); 5318 return skb; 5319 } 5320 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5321 ieee80211_pspoll_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5322 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5323 struct ieee80211_vif *vif) 5324 { 5325 struct ieee80211_sub_if_data *sdata; 5326 struct ieee80211_if_managed *ifmgd; 5327 struct ieee80211_pspoll *pspoll; 5328 struct ieee80211_local *local; 5329 struct sk_buff *skb; 5330 5331 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5332 return NULL; 5333 5334 sdata = vif_to_sdata(vif); 5335 ifmgd = &sdata->u.mgd; 5336 local = sdata->local; 5337 5338 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5339 if (!skb) 5340 return NULL; 5341 5342 skb_reserve(skb, local->hw.extra_tx_headroom); 5343 5344 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5345 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5346 IEEE80211_STYPE_PSPOLL); 5347 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5348 5349 /* aid in PS-Poll has its two MSBs each set to 1 */ 5350 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5351 5352 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5353 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5354 5355 return skb; 5356 } 5357 EXPORT_SYMBOL(ieee80211_pspoll_get); 5358 ieee80211_nullfunc_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,bool qos_ok)5359 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5360 struct ieee80211_vif *vif, 5361 bool qos_ok) 5362 { 5363 struct ieee80211_hdr_3addr *nullfunc; 5364 struct ieee80211_sub_if_data *sdata; 5365 struct ieee80211_if_managed *ifmgd; 5366 struct ieee80211_local *local; 5367 struct sk_buff *skb; 5368 bool qos = false; 5369 5370 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5371 return NULL; 5372 5373 sdata = vif_to_sdata(vif); 5374 ifmgd = &sdata->u.mgd; 5375 local = sdata->local; 5376 5377 if (qos_ok) { 5378 struct sta_info *sta; 5379 5380 rcu_read_lock(); 5381 sta = sta_info_get(sdata, ifmgd->bssid); 5382 qos = sta && sta->sta.wme; 5383 rcu_read_unlock(); 5384 } 5385 5386 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5387 sizeof(*nullfunc) + 2); 5388 if (!skb) 5389 return NULL; 5390 5391 skb_reserve(skb, local->hw.extra_tx_headroom); 5392 5393 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5394 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5395 IEEE80211_STYPE_NULLFUNC | 5396 IEEE80211_FCTL_TODS); 5397 if (qos) { 5398 __le16 qoshdr = cpu_to_le16(7); 5399 5400 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5401 IEEE80211_STYPE_NULLFUNC) != 5402 IEEE80211_STYPE_QOS_NULLFUNC); 5403 nullfunc->frame_control |= 5404 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5405 skb->priority = 7; 5406 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5407 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5408 } 5409 5410 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5411 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5412 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5413 5414 return skb; 5415 } 5416 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5417 ieee80211_probereq_get(struct ieee80211_hw * hw,const u8 * src_addr,const u8 * ssid,size_t ssid_len,size_t tailroom)5418 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5419 const u8 *src_addr, 5420 const u8 *ssid, size_t ssid_len, 5421 size_t tailroom) 5422 { 5423 struct ieee80211_local *local = hw_to_local(hw); 5424 struct ieee80211_hdr_3addr *hdr; 5425 struct sk_buff *skb; 5426 size_t ie_ssid_len; 5427 u8 *pos; 5428 5429 ie_ssid_len = 2 + ssid_len; 5430 5431 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5432 ie_ssid_len + tailroom); 5433 if (!skb) 5434 return NULL; 5435 5436 skb_reserve(skb, local->hw.extra_tx_headroom); 5437 5438 hdr = skb_put_zero(skb, sizeof(*hdr)); 5439 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5440 IEEE80211_STYPE_PROBE_REQ); 5441 eth_broadcast_addr(hdr->addr1); 5442 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5443 eth_broadcast_addr(hdr->addr3); 5444 5445 pos = skb_put(skb, ie_ssid_len); 5446 *pos++ = WLAN_EID_SSID; 5447 *pos++ = ssid_len; 5448 if (ssid_len) 5449 memcpy(pos, ssid, ssid_len); 5450 pos += ssid_len; 5451 5452 return skb; 5453 } 5454 EXPORT_SYMBOL(ieee80211_probereq_get); 5455 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)5456 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5457 const void *frame, size_t frame_len, 5458 const struct ieee80211_tx_info *frame_txctl, 5459 struct ieee80211_rts *rts) 5460 { 5461 const struct ieee80211_hdr *hdr = frame; 5462 5463 rts->frame_control = 5464 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5465 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5466 frame_txctl); 5467 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5468 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5469 } 5470 EXPORT_SYMBOL(ieee80211_rts_get); 5471 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)5472 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5473 const void *frame, size_t frame_len, 5474 const struct ieee80211_tx_info *frame_txctl, 5475 struct ieee80211_cts *cts) 5476 { 5477 const struct ieee80211_hdr *hdr = frame; 5478 5479 cts->frame_control = 5480 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5481 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5482 frame_len, frame_txctl); 5483 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5484 } 5485 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5486 5487 struct sk_buff * ieee80211_get_buffered_bc(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5488 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5489 struct ieee80211_vif *vif) 5490 { 5491 struct ieee80211_local *local = hw_to_local(hw); 5492 struct sk_buff *skb = NULL; 5493 struct ieee80211_tx_data tx; 5494 struct ieee80211_sub_if_data *sdata; 5495 struct ps_data *ps; 5496 struct ieee80211_tx_info *info; 5497 struct ieee80211_chanctx_conf *chanctx_conf; 5498 5499 sdata = vif_to_sdata(vif); 5500 5501 rcu_read_lock(); 5502 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5503 5504 if (!chanctx_conf) 5505 goto out; 5506 5507 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5508 struct beacon_data *beacon = 5509 rcu_dereference(sdata->u.ap.beacon); 5510 5511 if (!beacon || !beacon->head) 5512 goto out; 5513 5514 ps = &sdata->u.ap.ps; 5515 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5516 ps = &sdata->u.mesh.ps; 5517 } else { 5518 goto out; 5519 } 5520 5521 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5522 goto out; /* send buffered bc/mc only after DTIM beacon */ 5523 5524 while (1) { 5525 skb = skb_dequeue(&ps->bc_buf); 5526 if (!skb) 5527 goto out; 5528 local->total_ps_buffered--; 5529 5530 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5531 struct ieee80211_hdr *hdr = 5532 (struct ieee80211_hdr *) skb->data; 5533 /* more buffered multicast/broadcast frames ==> set 5534 * MoreData flag in IEEE 802.11 header to inform PS 5535 * STAs */ 5536 hdr->frame_control |= 5537 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5538 } 5539 5540 if (sdata->vif.type == NL80211_IFTYPE_AP) 5541 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5542 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5543 break; 5544 ieee80211_free_txskb(hw, skb); 5545 } 5546 5547 info = IEEE80211_SKB_CB(skb); 5548 5549 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5550 info->band = chanctx_conf->def.chan->band; 5551 5552 if (invoke_tx_handlers(&tx)) 5553 skb = NULL; 5554 out: 5555 rcu_read_unlock(); 5556 5557 return skb; 5558 } 5559 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5560 ieee80211_reserve_tid(struct ieee80211_sta * pubsta,u8 tid)5561 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5562 { 5563 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5564 struct ieee80211_sub_if_data *sdata = sta->sdata; 5565 struct ieee80211_local *local = sdata->local; 5566 int ret; 5567 u32 queues; 5568 5569 lockdep_assert_held(&local->sta_mtx); 5570 5571 /* only some cases are supported right now */ 5572 switch (sdata->vif.type) { 5573 case NL80211_IFTYPE_STATION: 5574 case NL80211_IFTYPE_AP: 5575 case NL80211_IFTYPE_AP_VLAN: 5576 break; 5577 default: 5578 WARN_ON(1); 5579 return -EINVAL; 5580 } 5581 5582 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5583 return -EINVAL; 5584 5585 if (sta->reserved_tid == tid) { 5586 ret = 0; 5587 goto out; 5588 } 5589 5590 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5591 sdata_err(sdata, "TID reservation already active\n"); 5592 ret = -EALREADY; 5593 goto out; 5594 } 5595 5596 ieee80211_stop_vif_queues(sdata->local, sdata, 5597 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5598 5599 synchronize_net(); 5600 5601 /* Tear down BA sessions so we stop aggregating on this TID */ 5602 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5603 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5604 __ieee80211_stop_tx_ba_session(sta, tid, 5605 AGG_STOP_LOCAL_REQUEST); 5606 } 5607 5608 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5609 __ieee80211_flush_queues(local, sdata, queues, false); 5610 5611 sta->reserved_tid = tid; 5612 5613 ieee80211_wake_vif_queues(local, sdata, 5614 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5615 5616 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5617 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5618 5619 ret = 0; 5620 out: 5621 return ret; 5622 } 5623 EXPORT_SYMBOL(ieee80211_reserve_tid); 5624 ieee80211_unreserve_tid(struct ieee80211_sta * pubsta,u8 tid)5625 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5626 { 5627 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5628 struct ieee80211_sub_if_data *sdata = sta->sdata; 5629 5630 lockdep_assert_held(&sdata->local->sta_mtx); 5631 5632 /* only some cases are supported right now */ 5633 switch (sdata->vif.type) { 5634 case NL80211_IFTYPE_STATION: 5635 case NL80211_IFTYPE_AP: 5636 case NL80211_IFTYPE_AP_VLAN: 5637 break; 5638 default: 5639 WARN_ON(1); 5640 return; 5641 } 5642 5643 if (tid != sta->reserved_tid) { 5644 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5645 return; 5646 } 5647 5648 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5649 } 5650 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5651 __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int tid,enum nl80211_band band)5652 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5653 struct sk_buff *skb, int tid, 5654 enum nl80211_band band) 5655 { 5656 int ac = ieee80211_ac_from_tid(tid); 5657 5658 skb_reset_mac_header(skb); 5659 skb_set_queue_mapping(skb, ac); 5660 skb->priority = tid; 5661 5662 skb->dev = sdata->dev; 5663 5664 /* 5665 * The other path calling ieee80211_xmit is from the tasklet, 5666 * and while we can handle concurrent transmissions locking 5667 * requirements are that we do not come into tx with bhs on. 5668 */ 5669 local_bh_disable(); 5670 IEEE80211_SKB_CB(skb)->band = band; 5671 ieee80211_xmit(sdata, NULL, skb); 5672 local_bh_enable(); 5673 } 5674 ieee80211_tx_control_port(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len,const u8 * dest,__be16 proto,bool unencrypted,u64 * cookie)5675 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5676 const u8 *buf, size_t len, 5677 const u8 *dest, __be16 proto, bool unencrypted, 5678 u64 *cookie) 5679 { 5680 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5681 struct ieee80211_local *local = sdata->local; 5682 struct sta_info *sta; 5683 struct sk_buff *skb; 5684 struct ethhdr *ehdr; 5685 u32 ctrl_flags = 0; 5686 u32 flags = 0; 5687 5688 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5689 * or Pre-Authentication 5690 */ 5691 if (proto != sdata->control_port_protocol && 5692 proto != cpu_to_be16(ETH_P_PREAUTH)) 5693 return -EINVAL; 5694 5695 if (proto == sdata->control_port_protocol) 5696 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5697 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5698 5699 if (unencrypted) 5700 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5701 5702 if (cookie) 5703 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5704 5705 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5706 5707 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5708 sizeof(struct ethhdr) + len); 5709 if (!skb) 5710 return -ENOMEM; 5711 5712 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5713 5714 skb_put_data(skb, buf, len); 5715 5716 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5717 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5718 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5719 ehdr->h_proto = proto; 5720 5721 skb->dev = dev; 5722 skb->protocol = proto; 5723 skb_reset_network_header(skb); 5724 skb_reset_mac_header(skb); 5725 5726 /* update QoS header to prioritize control port frames if possible, 5727 * priorization also happens for control port frames send over 5728 * AF_PACKET 5729 */ 5730 rcu_read_lock(); 5731 5732 if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) { 5733 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5734 5735 skb_set_queue_mapping(skb, queue); 5736 skb_get_hash(skb); 5737 } 5738 5739 rcu_read_unlock(); 5740 5741 /* mutex lock is only needed for incrementing the cookie counter */ 5742 mutex_lock(&local->mtx); 5743 5744 local_bh_disable(); 5745 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5746 local_bh_enable(); 5747 5748 mutex_unlock(&local->mtx); 5749 5750 return 0; 5751 } 5752 ieee80211_probe_mesh_link(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len)5753 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5754 const u8 *buf, size_t len) 5755 { 5756 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5757 struct ieee80211_local *local = sdata->local; 5758 struct sk_buff *skb; 5759 5760 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5761 30 + /* header size */ 5762 18); /* 11s header size */ 5763 if (!skb) 5764 return -ENOMEM; 5765 5766 skb_reserve(skb, local->hw.extra_tx_headroom); 5767 skb_put_data(skb, buf, len); 5768 5769 skb->dev = dev; 5770 skb->protocol = htons(ETH_P_802_3); 5771 skb_reset_network_header(skb); 5772 skb_reset_mac_header(skb); 5773 5774 local_bh_disable(); 5775 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5776 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5777 NULL); 5778 local_bh_enable(); 5779 5780 return 0; 5781 } 5782
