1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * 13 * Transmit and frame generation functions. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/skbuff.h> 19 #include <linux/etherdevice.h> 20 #include <linux/bitmap.h> 21 #include <linux/rcupdate.h> 22 #include <linux/export.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <net/codel.h> 28 #include <net/codel_impl.h> 29 #include <asm/unaligned.h> 30 #include <net/fq_impl.h> 31 32 #include "ieee80211_i.h" 33 #include "driver-ops.h" 34 #include "led.h" 35 #include "mesh.h" 36 #include "wep.h" 37 #include "wpa.h" 38 #include "wme.h" 39 #include "rate.h" 40 41 /* misc utils */ 42 43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 44 { 45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 46 47 u64_stats_update_begin(&tstats->syncp); 48 tstats->tx_packets++; 49 tstats->tx_bytes += len; 50 u64_stats_update_end(&tstats->syncp); 51 } 52 53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 54 struct sk_buff *skb, int group_addr, 55 int next_frag_len) 56 { 57 int rate, mrate, erp, dur, i, shift = 0; 58 struct ieee80211_rate *txrate; 59 struct ieee80211_local *local = tx->local; 60 struct ieee80211_supported_band *sband; 61 struct ieee80211_hdr *hdr; 62 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 63 struct ieee80211_chanctx_conf *chanctx_conf; 64 u32 rate_flags = 0; 65 66 rcu_read_lock(); 67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 68 if (chanctx_conf) { 69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 71 } 72 rcu_read_unlock(); 73 74 /* assume HW handles this */ 75 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 76 return 0; 77 78 /* uh huh? */ 79 if (WARN_ON_ONCE(tx->rate.idx < 0)) 80 return 0; 81 82 sband = local->hw.wiphy->bands[info->band]; 83 txrate = &sband->bitrates[tx->rate.idx]; 84 85 erp = txrate->flags & IEEE80211_RATE_ERP_G; 86 87 /* 88 * data and mgmt (except PS Poll): 89 * - during CFP: 32768 90 * - during contention period: 91 * if addr1 is group address: 0 92 * if more fragments = 0 and addr1 is individual address: time to 93 * transmit one ACK plus SIFS 94 * if more fragments = 1 and addr1 is individual address: time to 95 * transmit next fragment plus 2 x ACK plus 3 x SIFS 96 * 97 * IEEE 802.11, 9.6: 98 * - control response frame (CTS or ACK) shall be transmitted using the 99 * same rate as the immediately previous frame in the frame exchange 100 * sequence, if this rate belongs to the PHY mandatory rates, or else 101 * at the highest possible rate belonging to the PHY rates in the 102 * BSSBasicRateSet 103 */ 104 hdr = (struct ieee80211_hdr *)skb->data; 105 if (ieee80211_is_ctl(hdr->frame_control)) { 106 /* TODO: These control frames are not currently sent by 107 * mac80211, but should they be implemented, this function 108 * needs to be updated to support duration field calculation. 109 * 110 * RTS: time needed to transmit pending data/mgmt frame plus 111 * one CTS frame plus one ACK frame plus 3 x SIFS 112 * CTS: duration of immediately previous RTS minus time 113 * required to transmit CTS and its SIFS 114 * ACK: 0 if immediately previous directed data/mgmt had 115 * more=0, with more=1 duration in ACK frame is duration 116 * from previous frame minus time needed to transmit ACK 117 * and its SIFS 118 * PS Poll: BIT(15) | BIT(14) | aid 119 */ 120 return 0; 121 } 122 123 /* data/mgmt */ 124 if (0 /* FIX: data/mgmt during CFP */) 125 return cpu_to_le16(32768); 126 127 if (group_addr) /* Group address as the destination - no ACK */ 128 return 0; 129 130 /* Individual destination address: 131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 132 * CTS and ACK frames shall be transmitted using the highest rate in 133 * basic rate set that is less than or equal to the rate of the 134 * immediately previous frame and that is using the same modulation 135 * (CCK or OFDM). If no basic rate set matches with these requirements, 136 * the highest mandatory rate of the PHY that is less than or equal to 137 * the rate of the previous frame is used. 138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 139 */ 140 rate = -1; 141 /* use lowest available if everything fails */ 142 mrate = sband->bitrates[0].bitrate; 143 for (i = 0; i < sband->n_bitrates; i++) { 144 struct ieee80211_rate *r = &sband->bitrates[i]; 145 146 if (r->bitrate > txrate->bitrate) 147 break; 148 149 if ((rate_flags & r->flags) != rate_flags) 150 continue; 151 152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 154 155 switch (sband->band) { 156 case NL80211_BAND_2GHZ: { 157 u32 flag; 158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 159 flag = IEEE80211_RATE_MANDATORY_G; 160 else 161 flag = IEEE80211_RATE_MANDATORY_B; 162 if (r->flags & flag) 163 mrate = r->bitrate; 164 break; 165 } 166 case NL80211_BAND_5GHZ: 167 if (r->flags & IEEE80211_RATE_MANDATORY_A) 168 mrate = r->bitrate; 169 break; 170 case NL80211_BAND_60GHZ: 171 /* TODO, for now fall through */ 172 case NUM_NL80211_BANDS: 173 WARN_ON(1); 174 break; 175 } 176 } 177 if (rate == -1) { 178 /* No matching basic rate found; use highest suitable mandatory 179 * PHY rate */ 180 rate = DIV_ROUND_UP(mrate, 1 << shift); 181 } 182 183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 184 if (ieee80211_is_data_qos(hdr->frame_control) && 185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 186 dur = 0; 187 else 188 /* Time needed to transmit ACK 189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 190 * to closest integer */ 191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 192 tx->sdata->vif.bss_conf.use_short_preamble, 193 shift); 194 195 if (next_frag_len) { 196 /* Frame is fragmented: duration increases with time needed to 197 * transmit next fragment plus ACK and 2 x SIFS. */ 198 dur *= 2; /* ACK + SIFS */ 199 /* next fragment */ 200 dur += ieee80211_frame_duration(sband->band, next_frag_len, 201 txrate->bitrate, erp, 202 tx->sdata->vif.bss_conf.use_short_preamble, 203 shift); 204 } 205 206 return cpu_to_le16(dur); 207 } 208 209 /* tx handlers */ 210 static ieee80211_tx_result debug_noinline 211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 212 { 213 struct ieee80211_local *local = tx->local; 214 struct ieee80211_if_managed *ifmgd; 215 216 /* driver doesn't support power save */ 217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 218 return TX_CONTINUE; 219 220 /* hardware does dynamic power save */ 221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 222 return TX_CONTINUE; 223 224 /* dynamic power save disabled */ 225 if (local->hw.conf.dynamic_ps_timeout <= 0) 226 return TX_CONTINUE; 227 228 /* we are scanning, don't enable power save */ 229 if (local->scanning) 230 return TX_CONTINUE; 231 232 if (!local->ps_sdata) 233 return TX_CONTINUE; 234 235 /* No point if we're going to suspend */ 236 if (local->quiescing) 237 return TX_CONTINUE; 238 239 /* dynamic ps is supported only in managed mode */ 240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 241 return TX_CONTINUE; 242 243 ifmgd = &tx->sdata->u.mgd; 244 245 /* 246 * Don't wakeup from power save if u-apsd is enabled, voip ac has 247 * u-apsd enabled and the frame is in voip class. This effectively 248 * means that even if all access categories have u-apsd enabled, in 249 * practise u-apsd is only used with the voip ac. This is a 250 * workaround for the case when received voip class packets do not 251 * have correct qos tag for some reason, due the network or the 252 * peer application. 253 * 254 * Note: ifmgd->uapsd_queues access is racy here. If the value is 255 * changed via debugfs, user needs to reassociate manually to have 256 * everything in sync. 257 */ 258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 261 return TX_CONTINUE; 262 263 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 264 ieee80211_stop_queues_by_reason(&local->hw, 265 IEEE80211_MAX_QUEUE_MAP, 266 IEEE80211_QUEUE_STOP_REASON_PS, 267 false); 268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 269 ieee80211_queue_work(&local->hw, 270 &local->dynamic_ps_disable_work); 271 } 272 273 /* Don't restart the timer if we're not disassociated */ 274 if (!ifmgd->associated) 275 return TX_CONTINUE; 276 277 mod_timer(&local->dynamic_ps_timer, jiffies + 278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 279 280 return TX_CONTINUE; 281 } 282 283 static ieee80211_tx_result debug_noinline 284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 285 { 286 287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 289 bool assoc = false; 290 291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 292 return TX_CONTINUE; 293 294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 296 !ieee80211_is_probe_req(hdr->frame_control) && 297 !ieee80211_is_nullfunc(hdr->frame_control)) 298 /* 299 * When software scanning only nullfunc frames (to notify 300 * the sleep state to the AP) and probe requests (for the 301 * active scan) are allowed, all other frames should not be 302 * sent and we should not get here, but if we do 303 * nonetheless, drop them to avoid sending them 304 * off-channel. See the link below and 305 * ieee80211_start_scan() for more. 306 * 307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 308 */ 309 return TX_DROP; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 312 return TX_CONTINUE; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 315 return TX_CONTINUE; 316 317 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 318 return TX_CONTINUE; 319 320 if (tx->sta) 321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 322 323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 324 if (unlikely(!assoc && 325 ieee80211_is_data(hdr->frame_control))) { 326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 327 sdata_info(tx->sdata, 328 "dropped data frame to not associated station %pM\n", 329 hdr->addr1); 330 #endif 331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 332 return TX_DROP; 333 } 334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 335 ieee80211_is_data(hdr->frame_control) && 336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 337 /* 338 * No associated STAs - no need to send multicast 339 * frames. 340 */ 341 return TX_DROP; 342 } 343 344 return TX_CONTINUE; 345 } 346 347 /* This function is called whenever the AP is about to exceed the maximum limit 348 * of buffered frames for power saving STAs. This situation should not really 349 * happen often during normal operation, so dropping the oldest buffered packet 350 * from each queue should be OK to make some room for new frames. */ 351 static void purge_old_ps_buffers(struct ieee80211_local *local) 352 { 353 int total = 0, purged = 0; 354 struct sk_buff *skb; 355 struct ieee80211_sub_if_data *sdata; 356 struct sta_info *sta; 357 358 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 359 struct ps_data *ps; 360 361 if (sdata->vif.type == NL80211_IFTYPE_AP) 362 ps = &sdata->u.ap.ps; 363 else if (ieee80211_vif_is_mesh(&sdata->vif)) 364 ps = &sdata->u.mesh.ps; 365 else 366 continue; 367 368 skb = skb_dequeue(&ps->bc_buf); 369 if (skb) { 370 purged++; 371 ieee80211_free_txskb(&local->hw, skb); 372 } 373 total += skb_queue_len(&ps->bc_buf); 374 } 375 376 /* 377 * Drop one frame from each station from the lowest-priority 378 * AC that has frames at all. 379 */ 380 list_for_each_entry_rcu(sta, &local->sta_list, list) { 381 int ac; 382 383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 384 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 385 total += skb_queue_len(&sta->ps_tx_buf[ac]); 386 if (skb) { 387 purged++; 388 ieee80211_free_txskb(&local->hw, skb); 389 break; 390 } 391 } 392 } 393 394 local->total_ps_buffered = total; 395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 396 } 397 398 static ieee80211_tx_result 399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 400 { 401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 403 struct ps_data *ps; 404 405 /* 406 * broadcast/multicast frame 407 * 408 * If any of the associated/peer stations is in power save mode, 409 * the frame is buffered to be sent after DTIM beacon frame. 410 * This is done either by the hardware or us. 411 */ 412 413 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 416 if (!tx->sdata->bss) 417 return TX_CONTINUE; 418 419 ps = &tx->sdata->bss->ps; 420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 421 ps = &tx->sdata->u.mesh.ps; 422 } else { 423 return TX_CONTINUE; 424 } 425 426 427 /* no buffering for ordered frames */ 428 if (ieee80211_has_order(hdr->frame_control)) 429 return TX_CONTINUE; 430 431 if (ieee80211_is_probe_req(hdr->frame_control)) 432 return TX_CONTINUE; 433 434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 435 info->hw_queue = tx->sdata->vif.cab_queue; 436 437 /* no stations in PS mode */ 438 if (!atomic_read(&ps->num_sta_ps)) 439 return TX_CONTINUE; 440 441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 442 443 /* device releases frame after DTIM beacon */ 444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 445 return TX_CONTINUE; 446 447 /* buffered in mac80211 */ 448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 449 purge_old_ps_buffers(tx->local); 450 451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 452 ps_dbg(tx->sdata, 453 "BC TX buffer full - dropping the oldest frame\n"); 454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 455 } else 456 tx->local->total_ps_buffered++; 457 458 skb_queue_tail(&ps->bc_buf, tx->skb); 459 460 return TX_QUEUED; 461 } 462 463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 464 struct sk_buff *skb) 465 { 466 if (!ieee80211_is_mgmt(fc)) 467 return 0; 468 469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 470 return 0; 471 472 if (!ieee80211_is_robust_mgmt_frame(skb)) 473 return 0; 474 475 return 1; 476 } 477 478 static ieee80211_tx_result 479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 480 { 481 struct sta_info *sta = tx->sta; 482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 484 struct ieee80211_local *local = tx->local; 485 486 if (unlikely(!sta)) 487 return TX_CONTINUE; 488 489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 493 int ac = skb_get_queue_mapping(tx->skb); 494 495 if (ieee80211_is_mgmt(hdr->frame_control) && 496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 498 return TX_CONTINUE; 499 } 500 501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 502 sta->sta.addr, sta->sta.aid, ac); 503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 504 purge_old_ps_buffers(tx->local); 505 506 /* sync with ieee80211_sta_ps_deliver_wakeup */ 507 spin_lock(&sta->ps_lock); 508 /* 509 * STA woke up the meantime and all the frames on ps_tx_buf have 510 * been queued to pending queue. No reordering can happen, go 511 * ahead and Tx the packet. 512 */ 513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 516 spin_unlock(&sta->ps_lock); 517 return TX_CONTINUE; 518 } 519 520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 522 ps_dbg(tx->sdata, 523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 524 sta->sta.addr, ac); 525 ieee80211_free_txskb(&local->hw, old); 526 } else 527 tx->local->total_ps_buffered++; 528 529 info->control.jiffies = jiffies; 530 info->control.vif = &tx->sdata->vif; 531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 534 spin_unlock(&sta->ps_lock); 535 536 if (!timer_pending(&local->sta_cleanup)) 537 mod_timer(&local->sta_cleanup, 538 round_jiffies(jiffies + 539 STA_INFO_CLEANUP_INTERVAL)); 540 541 /* 542 * We queued up some frames, so the TIM bit might 543 * need to be set, recalculate it. 544 */ 545 sta_info_recalc_tim(sta); 546 547 return TX_QUEUED; 548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 549 ps_dbg(tx->sdata, 550 "STA %pM in PS mode, but polling/in SP -> send frame\n", 551 sta->sta.addr); 552 } 553 554 return TX_CONTINUE; 555 } 556 557 static ieee80211_tx_result debug_noinline 558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 559 { 560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 561 return TX_CONTINUE; 562 563 if (tx->flags & IEEE80211_TX_UNICAST) 564 return ieee80211_tx_h_unicast_ps_buf(tx); 565 else 566 return ieee80211_tx_h_multicast_ps_buf(tx); 567 } 568 569 static ieee80211_tx_result debug_noinline 570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 571 { 572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 573 574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 575 if (tx->sdata->control_port_no_encrypt) 576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 579 } 580 581 return TX_CONTINUE; 582 } 583 584 static ieee80211_tx_result debug_noinline 585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 586 { 587 struct ieee80211_key *key; 588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 590 591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 592 tx->key = NULL; 593 else if (tx->sta && 594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 595 tx->key = key; 596 else if (ieee80211_is_group_privacy_action(tx->skb) && 597 (key = rcu_dereference(tx->sdata->default_multicast_key))) 598 tx->key = key; 599 else if (ieee80211_is_mgmt(hdr->frame_control) && 600 is_multicast_ether_addr(hdr->addr1) && 601 ieee80211_is_robust_mgmt_frame(tx->skb) && 602 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 603 tx->key = key; 604 else if (is_multicast_ether_addr(hdr->addr1) && 605 (key = rcu_dereference(tx->sdata->default_multicast_key))) 606 tx->key = key; 607 else if (!is_multicast_ether_addr(hdr->addr1) && 608 (key = rcu_dereference(tx->sdata->default_unicast_key))) 609 tx->key = key; 610 else 611 tx->key = NULL; 612 613 if (tx->key) { 614 bool skip_hw = false; 615 616 /* TODO: add threshold stuff again */ 617 618 switch (tx->key->conf.cipher) { 619 case WLAN_CIPHER_SUITE_WEP40: 620 case WLAN_CIPHER_SUITE_WEP104: 621 case WLAN_CIPHER_SUITE_TKIP: 622 if (!ieee80211_is_data_present(hdr->frame_control)) 623 tx->key = NULL; 624 break; 625 case WLAN_CIPHER_SUITE_CCMP: 626 case WLAN_CIPHER_SUITE_CCMP_256: 627 case WLAN_CIPHER_SUITE_GCMP: 628 case WLAN_CIPHER_SUITE_GCMP_256: 629 if (!ieee80211_is_data_present(hdr->frame_control) && 630 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 631 tx->skb) && 632 !ieee80211_is_group_privacy_action(tx->skb)) 633 tx->key = NULL; 634 else 635 skip_hw = (tx->key->conf.flags & 636 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 637 ieee80211_is_mgmt(hdr->frame_control); 638 break; 639 case WLAN_CIPHER_SUITE_AES_CMAC: 640 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 641 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 642 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 643 if (!ieee80211_is_mgmt(hdr->frame_control)) 644 tx->key = NULL; 645 break; 646 } 647 648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 649 !ieee80211_is_deauth(hdr->frame_control))) 650 return TX_DROP; 651 652 if (!skip_hw && tx->key && 653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 654 info->control.hw_key = &tx->key->conf; 655 } 656 657 return TX_CONTINUE; 658 } 659 660 static ieee80211_tx_result debug_noinline 661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 662 { 663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 664 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 665 struct ieee80211_supported_band *sband; 666 u32 len; 667 struct ieee80211_tx_rate_control txrc; 668 struct ieee80211_sta_rates *ratetbl = NULL; 669 bool assoc = false; 670 671 memset(&txrc, 0, sizeof(txrc)); 672 673 sband = tx->local->hw.wiphy->bands[info->band]; 674 675 len = min_t(u32, tx->skb->len + FCS_LEN, 676 tx->local->hw.wiphy->frag_threshold); 677 678 /* set up the tx rate control struct we give the RC algo */ 679 txrc.hw = &tx->local->hw; 680 txrc.sband = sband; 681 txrc.bss_conf = &tx->sdata->vif.bss_conf; 682 txrc.skb = tx->skb; 683 txrc.reported_rate.idx = -1; 684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 685 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 686 txrc.max_rate_idx = -1; 687 else 688 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 689 690 if (tx->sdata->rc_has_mcs_mask[info->band]) 691 txrc.rate_idx_mcs_mask = 692 tx->sdata->rc_rateidx_mcs_mask[info->band]; 693 694 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 695 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 696 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 697 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 698 699 /* set up RTS protection if desired */ 700 if (len > tx->local->hw.wiphy->rts_threshold) { 701 txrc.rts = true; 702 } 703 704 info->control.use_rts = txrc.rts; 705 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 706 707 /* 708 * Use short preamble if the BSS can handle it, but not for 709 * management frames unless we know the receiver can handle 710 * that -- the management frame might be to a station that 711 * just wants a probe response. 712 */ 713 if (tx->sdata->vif.bss_conf.use_short_preamble && 714 (ieee80211_is_data(hdr->frame_control) || 715 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 716 txrc.short_preamble = true; 717 718 info->control.short_preamble = txrc.short_preamble; 719 720 /* don't ask rate control when rate already injected via radiotap */ 721 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 722 return TX_CONTINUE; 723 724 if (tx->sta) 725 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 726 727 /* 728 * Lets not bother rate control if we're associated and cannot 729 * talk to the sta. This should not happen. 730 */ 731 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 732 !rate_usable_index_exists(sband, &tx->sta->sta), 733 "%s: Dropped data frame as no usable bitrate found while " 734 "scanning and associated. Target station: " 735 "%pM on %d GHz band\n", 736 tx->sdata->name, hdr->addr1, 737 info->band ? 5 : 2)) 738 return TX_DROP; 739 740 /* 741 * If we're associated with the sta at this point we know we can at 742 * least send the frame at the lowest bit rate. 743 */ 744 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 745 746 if (tx->sta && !info->control.skip_table) 747 ratetbl = rcu_dereference(tx->sta->sta.rates); 748 749 if (unlikely(info->control.rates[0].idx < 0)) { 750 if (ratetbl) { 751 struct ieee80211_tx_rate rate = { 752 .idx = ratetbl->rate[0].idx, 753 .flags = ratetbl->rate[0].flags, 754 .count = ratetbl->rate[0].count 755 }; 756 757 if (ratetbl->rate[0].idx < 0) 758 return TX_DROP; 759 760 tx->rate = rate; 761 } else { 762 return TX_DROP; 763 } 764 } else { 765 tx->rate = info->control.rates[0]; 766 } 767 768 if (txrc.reported_rate.idx < 0) { 769 txrc.reported_rate = tx->rate; 770 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 771 tx->sta->tx_stats.last_rate = txrc.reported_rate; 772 } else if (tx->sta) 773 tx->sta->tx_stats.last_rate = txrc.reported_rate; 774 775 if (ratetbl) 776 return TX_CONTINUE; 777 778 if (unlikely(!info->control.rates[0].count)) 779 info->control.rates[0].count = 1; 780 781 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 782 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 783 info->control.rates[0].count = 1; 784 785 return TX_CONTINUE; 786 } 787 788 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 789 { 790 u16 *seq = &sta->tid_seq[tid]; 791 __le16 ret = cpu_to_le16(*seq); 792 793 /* Increase the sequence number. */ 794 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 795 796 return ret; 797 } 798 799 static ieee80211_tx_result debug_noinline 800 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 801 { 802 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 803 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 804 u8 *qc; 805 int tid; 806 807 /* 808 * Packet injection may want to control the sequence 809 * number, if we have no matching interface then we 810 * neither assign one ourselves nor ask the driver to. 811 */ 812 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 813 return TX_CONTINUE; 814 815 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 816 return TX_CONTINUE; 817 818 if (ieee80211_hdrlen(hdr->frame_control) < 24) 819 return TX_CONTINUE; 820 821 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 822 return TX_CONTINUE; 823 824 /* 825 * Anything but QoS data that has a sequence number field 826 * (is long enough) gets a sequence number from the global 827 * counter. QoS data frames with a multicast destination 828 * also use the global counter (802.11-2012 9.3.2.10). 829 */ 830 if (!ieee80211_is_data_qos(hdr->frame_control) || 831 is_multicast_ether_addr(hdr->addr1)) { 832 /* driver should assign sequence number */ 833 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 834 /* for pure STA mode without beacons, we can do it */ 835 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 836 tx->sdata->sequence_number += 0x10; 837 if (tx->sta) 838 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 839 return TX_CONTINUE; 840 } 841 842 /* 843 * This should be true for injected/management frames only, for 844 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 845 * above since they are not QoS-data frames. 846 */ 847 if (!tx->sta) 848 return TX_CONTINUE; 849 850 /* include per-STA, per-TID sequence counter */ 851 852 qc = ieee80211_get_qos_ctl(hdr); 853 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 854 tx->sta->tx_stats.msdu[tid]++; 855 856 if (!tx->sta->sta.txq[0]) 857 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 858 859 return TX_CONTINUE; 860 } 861 862 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 863 struct sk_buff *skb, int hdrlen, 864 int frag_threshold) 865 { 866 struct ieee80211_local *local = tx->local; 867 struct ieee80211_tx_info *info; 868 struct sk_buff *tmp; 869 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 870 int pos = hdrlen + per_fragm; 871 int rem = skb->len - hdrlen - per_fragm; 872 873 if (WARN_ON(rem < 0)) 874 return -EINVAL; 875 876 /* first fragment was already added to queue by caller */ 877 878 while (rem) { 879 int fraglen = per_fragm; 880 881 if (fraglen > rem) 882 fraglen = rem; 883 rem -= fraglen; 884 tmp = dev_alloc_skb(local->tx_headroom + 885 frag_threshold + 886 tx->sdata->encrypt_headroom + 887 IEEE80211_ENCRYPT_TAILROOM); 888 if (!tmp) 889 return -ENOMEM; 890 891 __skb_queue_tail(&tx->skbs, tmp); 892 893 skb_reserve(tmp, 894 local->tx_headroom + tx->sdata->encrypt_headroom); 895 896 /* copy control information */ 897 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 898 899 info = IEEE80211_SKB_CB(tmp); 900 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 901 IEEE80211_TX_CTL_FIRST_FRAGMENT); 902 903 if (rem) 904 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 905 906 skb_copy_queue_mapping(tmp, skb); 907 tmp->priority = skb->priority; 908 tmp->dev = skb->dev; 909 910 /* copy header and data */ 911 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 912 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 913 914 pos += fraglen; 915 } 916 917 /* adjust first fragment's length */ 918 skb_trim(skb, hdrlen + per_fragm); 919 return 0; 920 } 921 922 static ieee80211_tx_result debug_noinline 923 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 924 { 925 struct sk_buff *skb = tx->skb; 926 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 927 struct ieee80211_hdr *hdr = (void *)skb->data; 928 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 929 int hdrlen; 930 int fragnum; 931 932 /* no matter what happens, tx->skb moves to tx->skbs */ 933 __skb_queue_tail(&tx->skbs, skb); 934 tx->skb = NULL; 935 936 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 937 return TX_CONTINUE; 938 939 if (tx->local->ops->set_frag_threshold) 940 return TX_CONTINUE; 941 942 /* 943 * Warn when submitting a fragmented A-MPDU frame and drop it. 944 * This scenario is handled in ieee80211_tx_prepare but extra 945 * caution taken here as fragmented ampdu may cause Tx stop. 946 */ 947 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 948 return TX_DROP; 949 950 hdrlen = ieee80211_hdrlen(hdr->frame_control); 951 952 /* internal error, why isn't DONTFRAG set? */ 953 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 954 return TX_DROP; 955 956 /* 957 * Now fragment the frame. This will allocate all the fragments and 958 * chain them (using skb as the first fragment) to skb->next. 959 * During transmission, we will remove the successfully transmitted 960 * fragments from this list. When the low-level driver rejects one 961 * of the fragments then we will simply pretend to accept the skb 962 * but store it away as pending. 963 */ 964 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 965 return TX_DROP; 966 967 /* update duration/seq/flags of fragments */ 968 fragnum = 0; 969 970 skb_queue_walk(&tx->skbs, skb) { 971 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 972 973 hdr = (void *)skb->data; 974 info = IEEE80211_SKB_CB(skb); 975 976 if (!skb_queue_is_last(&tx->skbs, skb)) { 977 hdr->frame_control |= morefrags; 978 /* 979 * No multi-rate retries for fragmented frames, that 980 * would completely throw off the NAV at other STAs. 981 */ 982 info->control.rates[1].idx = -1; 983 info->control.rates[2].idx = -1; 984 info->control.rates[3].idx = -1; 985 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 986 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 987 } else { 988 hdr->frame_control &= ~morefrags; 989 } 990 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 991 fragnum++; 992 } 993 994 return TX_CONTINUE; 995 } 996 997 static ieee80211_tx_result debug_noinline 998 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 999 { 1000 struct sk_buff *skb; 1001 int ac = -1; 1002 1003 if (!tx->sta) 1004 return TX_CONTINUE; 1005 1006 skb_queue_walk(&tx->skbs, skb) { 1007 ac = skb_get_queue_mapping(skb); 1008 tx->sta->tx_stats.bytes[ac] += skb->len; 1009 } 1010 if (ac >= 0) 1011 tx->sta->tx_stats.packets[ac]++; 1012 1013 return TX_CONTINUE; 1014 } 1015 1016 static ieee80211_tx_result debug_noinline 1017 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1018 { 1019 if (!tx->key) 1020 return TX_CONTINUE; 1021 1022 switch (tx->key->conf.cipher) { 1023 case WLAN_CIPHER_SUITE_WEP40: 1024 case WLAN_CIPHER_SUITE_WEP104: 1025 return ieee80211_crypto_wep_encrypt(tx); 1026 case WLAN_CIPHER_SUITE_TKIP: 1027 return ieee80211_crypto_tkip_encrypt(tx); 1028 case WLAN_CIPHER_SUITE_CCMP: 1029 return ieee80211_crypto_ccmp_encrypt( 1030 tx, IEEE80211_CCMP_MIC_LEN); 1031 case WLAN_CIPHER_SUITE_CCMP_256: 1032 return ieee80211_crypto_ccmp_encrypt( 1033 tx, IEEE80211_CCMP_256_MIC_LEN); 1034 case WLAN_CIPHER_SUITE_AES_CMAC: 1035 return ieee80211_crypto_aes_cmac_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1037 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1038 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1039 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1040 return ieee80211_crypto_aes_gmac_encrypt(tx); 1041 case WLAN_CIPHER_SUITE_GCMP: 1042 case WLAN_CIPHER_SUITE_GCMP_256: 1043 return ieee80211_crypto_gcmp_encrypt(tx); 1044 default: 1045 return ieee80211_crypto_hw_encrypt(tx); 1046 } 1047 1048 return TX_DROP; 1049 } 1050 1051 static ieee80211_tx_result debug_noinline 1052 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1053 { 1054 struct sk_buff *skb; 1055 struct ieee80211_hdr *hdr; 1056 int next_len; 1057 bool group_addr; 1058 1059 skb_queue_walk(&tx->skbs, skb) { 1060 hdr = (void *) skb->data; 1061 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1062 break; /* must not overwrite AID */ 1063 if (!skb_queue_is_last(&tx->skbs, skb)) { 1064 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1065 next_len = next->len; 1066 } else 1067 next_len = 0; 1068 group_addr = is_multicast_ether_addr(hdr->addr1); 1069 1070 hdr->duration_id = 1071 ieee80211_duration(tx, skb, group_addr, next_len); 1072 } 1073 1074 return TX_CONTINUE; 1075 } 1076 1077 /* actual transmit path */ 1078 1079 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1080 struct sk_buff *skb, 1081 struct ieee80211_tx_info *info, 1082 struct tid_ampdu_tx *tid_tx, 1083 int tid) 1084 { 1085 bool queued = false; 1086 bool reset_agg_timer = false; 1087 struct sk_buff *purge_skb = NULL; 1088 1089 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1090 info->flags |= IEEE80211_TX_CTL_AMPDU; 1091 reset_agg_timer = true; 1092 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1093 /* 1094 * nothing -- this aggregation session is being started 1095 * but that might still fail with the driver 1096 */ 1097 } else if (!tx->sta->sta.txq[tid]) { 1098 spin_lock(&tx->sta->lock); 1099 /* 1100 * Need to re-check now, because we may get here 1101 * 1102 * 1) in the window during which the setup is actually 1103 * already done, but not marked yet because not all 1104 * packets are spliced over to the driver pending 1105 * queue yet -- if this happened we acquire the lock 1106 * either before or after the splice happens, but 1107 * need to recheck which of these cases happened. 1108 * 1109 * 2) during session teardown, if the OPERATIONAL bit 1110 * was cleared due to the teardown but the pointer 1111 * hasn't been assigned NULL yet (or we loaded it 1112 * before it was assigned) -- in this case it may 1113 * now be NULL which means we should just let the 1114 * packet pass through because splicing the frames 1115 * back is already done. 1116 */ 1117 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1118 1119 if (!tid_tx) { 1120 /* do nothing, let packet pass through */ 1121 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1122 info->flags |= IEEE80211_TX_CTL_AMPDU; 1123 reset_agg_timer = true; 1124 } else { 1125 queued = true; 1126 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1127 clear_sta_flag(tx->sta, WLAN_STA_SP); 1128 ps_dbg(tx->sta->sdata, 1129 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1130 tx->sta->sta.addr, tx->sta->sta.aid); 1131 } 1132 info->control.vif = &tx->sdata->vif; 1133 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1134 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1135 __skb_queue_tail(&tid_tx->pending, skb); 1136 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1137 purge_skb = __skb_dequeue(&tid_tx->pending); 1138 } 1139 spin_unlock(&tx->sta->lock); 1140 1141 if (purge_skb) 1142 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1143 } 1144 1145 /* reset session timer */ 1146 if (reset_agg_timer && tid_tx->timeout) 1147 tid_tx->last_tx = jiffies; 1148 1149 return queued; 1150 } 1151 1152 /* 1153 * initialises @tx 1154 * pass %NULL for the station if unknown, a valid pointer if known 1155 * or an ERR_PTR() if the station is known not to exist 1156 */ 1157 static ieee80211_tx_result 1158 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1159 struct ieee80211_tx_data *tx, 1160 struct sta_info *sta, struct sk_buff *skb) 1161 { 1162 struct ieee80211_local *local = sdata->local; 1163 struct ieee80211_hdr *hdr; 1164 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1165 int tid; 1166 u8 *qc; 1167 1168 memset(tx, 0, sizeof(*tx)); 1169 tx->skb = skb; 1170 tx->local = local; 1171 tx->sdata = sdata; 1172 __skb_queue_head_init(&tx->skbs); 1173 1174 /* 1175 * If this flag is set to true anywhere, and we get here, 1176 * we are doing the needed processing, so remove the flag 1177 * now. 1178 */ 1179 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1180 1181 hdr = (struct ieee80211_hdr *) skb->data; 1182 1183 if (likely(sta)) { 1184 if (!IS_ERR(sta)) 1185 tx->sta = sta; 1186 } else { 1187 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1188 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1189 if (!tx->sta && sdata->wdev.use_4addr) 1190 return TX_DROP; 1191 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1192 IEEE80211_TX_CTL_INJECTED) || 1193 tx->sdata->control_port_protocol == tx->skb->protocol) { 1194 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1195 } 1196 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1197 tx->sta = sta_info_get(sdata, hdr->addr1); 1198 } 1199 1200 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1201 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1202 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1203 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1204 struct tid_ampdu_tx *tid_tx; 1205 1206 qc = ieee80211_get_qos_ctl(hdr); 1207 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1208 1209 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1210 if (tid_tx) { 1211 bool queued; 1212 1213 queued = ieee80211_tx_prep_agg(tx, skb, info, 1214 tid_tx, tid); 1215 1216 if (unlikely(queued)) 1217 return TX_QUEUED; 1218 } 1219 } 1220 1221 if (is_multicast_ether_addr(hdr->addr1)) { 1222 tx->flags &= ~IEEE80211_TX_UNICAST; 1223 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1224 } else 1225 tx->flags |= IEEE80211_TX_UNICAST; 1226 1227 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1228 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1229 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1230 info->flags & IEEE80211_TX_CTL_AMPDU) 1231 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1232 } 1233 1234 if (!tx->sta) 1235 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1236 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1237 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1238 ieee80211_check_fast_xmit(tx->sta); 1239 } 1240 1241 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1242 1243 return TX_CONTINUE; 1244 } 1245 1246 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1247 struct ieee80211_vif *vif, 1248 struct ieee80211_sta *pubsta, 1249 struct sk_buff *skb) 1250 { 1251 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1252 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1253 struct ieee80211_txq *txq = NULL; 1254 1255 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1256 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1257 return NULL; 1258 1259 if (!ieee80211_is_data(hdr->frame_control)) 1260 return NULL; 1261 1262 if (pubsta) { 1263 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1264 1265 txq = pubsta->txq[tid]; 1266 } else if (vif) { 1267 txq = vif->txq; 1268 } 1269 1270 if (!txq) 1271 return NULL; 1272 1273 return to_txq_info(txq); 1274 } 1275 1276 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1277 { 1278 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1279 } 1280 1281 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi) 1282 { 1283 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif; 1284 } 1285 1286 static u32 codel_skb_len_func(const struct sk_buff *skb) 1287 { 1288 return skb->len; 1289 } 1290 1291 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1292 { 1293 const struct ieee80211_tx_info *info; 1294 1295 info = (const struct ieee80211_tx_info *)skb->cb; 1296 return info->control.enqueue_time; 1297 } 1298 1299 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1300 void *ctx) 1301 { 1302 struct ieee80211_local *local; 1303 struct txq_info *txqi; 1304 struct fq *fq; 1305 struct fq_flow *flow; 1306 1307 txqi = ctx; 1308 local = vif_to_sdata(txqi->txq.vif)->local; 1309 fq = &local->fq; 1310 1311 if (cvars == &txqi->def_cvars) 1312 flow = &txqi->def_flow; 1313 else 1314 flow = &fq->flows[cvars - local->cvars]; 1315 1316 return fq_flow_dequeue(fq, flow); 1317 } 1318 1319 static void codel_drop_func(struct sk_buff *skb, 1320 void *ctx) 1321 { 1322 struct ieee80211_local *local; 1323 struct ieee80211_hw *hw; 1324 struct txq_info *txqi; 1325 1326 txqi = ctx; 1327 local = vif_to_sdata(txqi->txq.vif)->local; 1328 hw = &local->hw; 1329 1330 ieee80211_free_txskb(hw, skb); 1331 } 1332 1333 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1334 struct fq_tin *tin, 1335 struct fq_flow *flow) 1336 { 1337 struct ieee80211_local *local; 1338 struct txq_info *txqi; 1339 struct codel_vars *cvars; 1340 struct codel_params *cparams; 1341 struct codel_stats *cstats; 1342 1343 local = container_of(fq, struct ieee80211_local, fq); 1344 txqi = container_of(tin, struct txq_info, tin); 1345 cparams = &local->cparams; 1346 cstats = &local->cstats; 1347 1348 if (flow == &txqi->def_flow) 1349 cvars = &txqi->def_cvars; 1350 else 1351 cvars = &local->cvars[flow - fq->flows]; 1352 1353 return codel_dequeue(txqi, 1354 &flow->backlog, 1355 cparams, 1356 cvars, 1357 cstats, 1358 codel_skb_len_func, 1359 codel_skb_time_func, 1360 codel_drop_func, 1361 codel_dequeue_func); 1362 } 1363 1364 static void fq_skb_free_func(struct fq *fq, 1365 struct fq_tin *tin, 1366 struct fq_flow *flow, 1367 struct sk_buff *skb) 1368 { 1369 struct ieee80211_local *local; 1370 1371 local = container_of(fq, struct ieee80211_local, fq); 1372 ieee80211_free_txskb(&local->hw, skb); 1373 } 1374 1375 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1376 struct fq_tin *tin, 1377 int idx, 1378 struct sk_buff *skb) 1379 { 1380 struct txq_info *txqi; 1381 1382 txqi = container_of(tin, struct txq_info, tin); 1383 return &txqi->def_flow; 1384 } 1385 1386 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1387 struct txq_info *txqi, 1388 struct sk_buff *skb) 1389 { 1390 struct fq *fq = &local->fq; 1391 struct fq_tin *tin = &txqi->tin; 1392 1393 ieee80211_set_skb_enqueue_time(skb); 1394 fq_tin_enqueue(fq, tin, skb, 1395 fq_skb_free_func, 1396 fq_flow_get_default_func); 1397 } 1398 1399 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1400 struct sta_info *sta, 1401 struct txq_info *txqi, int tid) 1402 { 1403 fq_tin_init(&txqi->tin); 1404 fq_flow_init(&txqi->def_flow); 1405 codel_vars_init(&txqi->def_cvars); 1406 1407 txqi->txq.vif = &sdata->vif; 1408 1409 if (sta) { 1410 txqi->txq.sta = &sta->sta; 1411 sta->sta.txq[tid] = &txqi->txq; 1412 txqi->txq.tid = tid; 1413 txqi->txq.ac = ieee802_1d_to_ac[tid & 7]; 1414 } else { 1415 sdata->vif.txq = &txqi->txq; 1416 txqi->txq.tid = 0; 1417 txqi->txq.ac = IEEE80211_AC_BE; 1418 } 1419 } 1420 1421 void ieee80211_txq_purge(struct ieee80211_local *local, 1422 struct txq_info *txqi) 1423 { 1424 struct fq *fq = &local->fq; 1425 struct fq_tin *tin = &txqi->tin; 1426 1427 fq_tin_reset(fq, tin, fq_skb_free_func); 1428 } 1429 1430 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1431 { 1432 struct fq *fq = &local->fq; 1433 int ret; 1434 int i; 1435 1436 if (!local->ops->wake_tx_queue) 1437 return 0; 1438 1439 ret = fq_init(fq, 4096); 1440 if (ret) 1441 return ret; 1442 1443 codel_params_init(&local->cparams); 1444 codel_stats_init(&local->cstats); 1445 local->cparams.interval = MS2TIME(100); 1446 local->cparams.target = MS2TIME(20); 1447 local->cparams.ecn = true; 1448 1449 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1450 GFP_KERNEL); 1451 if (!local->cvars) { 1452 spin_lock_bh(&fq->lock); 1453 fq_reset(fq, fq_skb_free_func); 1454 spin_unlock_bh(&fq->lock); 1455 return -ENOMEM; 1456 } 1457 1458 for (i = 0; i < fq->flows_cnt; i++) 1459 codel_vars_init(&local->cvars[i]); 1460 1461 return 0; 1462 } 1463 1464 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1465 { 1466 struct fq *fq = &local->fq; 1467 1468 if (!local->ops->wake_tx_queue) 1469 return; 1470 1471 kfree(local->cvars); 1472 local->cvars = NULL; 1473 1474 spin_lock_bh(&fq->lock); 1475 fq_reset(fq, fq_skb_free_func); 1476 spin_unlock_bh(&fq->lock); 1477 } 1478 1479 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 1480 struct ieee80211_txq *txq) 1481 { 1482 struct ieee80211_local *local = hw_to_local(hw); 1483 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 1484 struct ieee80211_hdr *hdr; 1485 struct sk_buff *skb = NULL; 1486 struct fq *fq = &local->fq; 1487 struct fq_tin *tin = &txqi->tin; 1488 1489 spin_lock_bh(&fq->lock); 1490 1491 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 1492 goto out; 1493 1494 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 1495 if (!skb) 1496 goto out; 1497 1498 ieee80211_set_skb_vif(skb, txqi); 1499 1500 hdr = (struct ieee80211_hdr *)skb->data; 1501 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) { 1502 struct sta_info *sta = container_of(txq->sta, struct sta_info, 1503 sta); 1504 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1505 1506 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid); 1507 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 1508 info->flags |= IEEE80211_TX_CTL_AMPDU; 1509 else 1510 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 1511 } 1512 1513 out: 1514 spin_unlock_bh(&fq->lock); 1515 1516 if (skb && skb_has_frag_list(skb) && 1517 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) 1518 skb_linearize(skb); 1519 1520 return skb; 1521 } 1522 EXPORT_SYMBOL(ieee80211_tx_dequeue); 1523 1524 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1525 struct ieee80211_vif *vif, 1526 struct ieee80211_sta *sta, 1527 struct sk_buff_head *skbs, 1528 bool txpending) 1529 { 1530 struct ieee80211_tx_control control = {}; 1531 struct fq *fq = &local->fq; 1532 struct sk_buff *skb, *tmp; 1533 struct txq_info *txqi; 1534 unsigned long flags; 1535 1536 skb_queue_walk_safe(skbs, skb, tmp) { 1537 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1538 int q = info->hw_queue; 1539 1540 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1541 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1542 __skb_unlink(skb, skbs); 1543 ieee80211_free_txskb(&local->hw, skb); 1544 continue; 1545 } 1546 #endif 1547 1548 txqi = ieee80211_get_txq(local, vif, sta, skb); 1549 if (txqi) { 1550 info->control.vif = vif; 1551 1552 __skb_unlink(skb, skbs); 1553 1554 spin_lock_bh(&fq->lock); 1555 ieee80211_txq_enqueue(local, txqi, skb); 1556 spin_unlock_bh(&fq->lock); 1557 1558 drv_wake_tx_queue(local, txqi); 1559 1560 continue; 1561 } 1562 1563 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1564 if (local->queue_stop_reasons[q] || 1565 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1566 if (unlikely(info->flags & 1567 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1568 if (local->queue_stop_reasons[q] & 1569 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1570 /* 1571 * Drop off-channel frames if queues 1572 * are stopped for any reason other 1573 * than off-channel operation. Never 1574 * queue them. 1575 */ 1576 spin_unlock_irqrestore( 1577 &local->queue_stop_reason_lock, 1578 flags); 1579 ieee80211_purge_tx_queue(&local->hw, 1580 skbs); 1581 return true; 1582 } 1583 } else { 1584 1585 /* 1586 * Since queue is stopped, queue up frames for 1587 * later transmission from the tx-pending 1588 * tasklet when the queue is woken again. 1589 */ 1590 if (txpending) 1591 skb_queue_splice_init(skbs, 1592 &local->pending[q]); 1593 else 1594 skb_queue_splice_tail_init(skbs, 1595 &local->pending[q]); 1596 1597 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1598 flags); 1599 return false; 1600 } 1601 } 1602 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1603 1604 info->control.vif = vif; 1605 control.sta = sta; 1606 1607 __skb_unlink(skb, skbs); 1608 drv_tx(local, &control, skb); 1609 } 1610 1611 return true; 1612 } 1613 1614 /* 1615 * Returns false if the frame couldn't be transmitted but was queued instead. 1616 */ 1617 static bool __ieee80211_tx(struct ieee80211_local *local, 1618 struct sk_buff_head *skbs, int led_len, 1619 struct sta_info *sta, bool txpending) 1620 { 1621 struct ieee80211_tx_info *info; 1622 struct ieee80211_sub_if_data *sdata; 1623 struct ieee80211_vif *vif; 1624 struct ieee80211_sta *pubsta; 1625 struct sk_buff *skb; 1626 bool result = true; 1627 __le16 fc; 1628 1629 if (WARN_ON(skb_queue_empty(skbs))) 1630 return true; 1631 1632 skb = skb_peek(skbs); 1633 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1634 info = IEEE80211_SKB_CB(skb); 1635 sdata = vif_to_sdata(info->control.vif); 1636 if (sta && !sta->uploaded) 1637 sta = NULL; 1638 1639 if (sta) 1640 pubsta = &sta->sta; 1641 else 1642 pubsta = NULL; 1643 1644 switch (sdata->vif.type) { 1645 case NL80211_IFTYPE_MONITOR: 1646 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1647 vif = &sdata->vif; 1648 break; 1649 } 1650 sdata = rcu_dereference(local->monitor_sdata); 1651 if (sdata) { 1652 vif = &sdata->vif; 1653 info->hw_queue = 1654 vif->hw_queue[skb_get_queue_mapping(skb)]; 1655 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1656 ieee80211_purge_tx_queue(&local->hw, skbs); 1657 return true; 1658 } else 1659 vif = NULL; 1660 break; 1661 case NL80211_IFTYPE_AP_VLAN: 1662 sdata = container_of(sdata->bss, 1663 struct ieee80211_sub_if_data, u.ap); 1664 /* fall through */ 1665 default: 1666 vif = &sdata->vif; 1667 break; 1668 } 1669 1670 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1671 txpending); 1672 1673 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1674 1675 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1676 1677 return result; 1678 } 1679 1680 /* 1681 * Invoke TX handlers, return 0 on success and non-zero if the 1682 * frame was dropped or queued. 1683 */ 1684 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1685 { 1686 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1687 ieee80211_tx_result res = TX_DROP; 1688 1689 #define CALL_TXH(txh) \ 1690 do { \ 1691 res = txh(tx); \ 1692 if (res != TX_CONTINUE) \ 1693 goto txh_done; \ 1694 } while (0) 1695 1696 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1697 CALL_TXH(ieee80211_tx_h_check_assoc); 1698 CALL_TXH(ieee80211_tx_h_ps_buf); 1699 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1700 CALL_TXH(ieee80211_tx_h_select_key); 1701 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1702 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1703 1704 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1705 __skb_queue_tail(&tx->skbs, tx->skb); 1706 tx->skb = NULL; 1707 goto txh_done; 1708 } 1709 1710 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1711 CALL_TXH(ieee80211_tx_h_sequence); 1712 CALL_TXH(ieee80211_tx_h_fragment); 1713 /* handlers after fragment must be aware of tx info fragmentation! */ 1714 CALL_TXH(ieee80211_tx_h_stats); 1715 CALL_TXH(ieee80211_tx_h_encrypt); 1716 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1717 CALL_TXH(ieee80211_tx_h_calculate_duration); 1718 #undef CALL_TXH 1719 1720 txh_done: 1721 if (unlikely(res == TX_DROP)) { 1722 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1723 if (tx->skb) 1724 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1725 else 1726 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1727 return -1; 1728 } else if (unlikely(res == TX_QUEUED)) { 1729 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1730 return -1; 1731 } 1732 1733 return 0; 1734 } 1735 1736 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1737 struct ieee80211_vif *vif, struct sk_buff *skb, 1738 int band, struct ieee80211_sta **sta) 1739 { 1740 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1741 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1742 struct ieee80211_tx_data tx; 1743 struct sk_buff *skb2; 1744 1745 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1746 return false; 1747 1748 info->band = band; 1749 info->control.vif = vif; 1750 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1751 1752 if (invoke_tx_handlers(&tx)) 1753 return false; 1754 1755 if (sta) { 1756 if (tx.sta) 1757 *sta = &tx.sta->sta; 1758 else 1759 *sta = NULL; 1760 } 1761 1762 /* this function isn't suitable for fragmented data frames */ 1763 skb2 = __skb_dequeue(&tx.skbs); 1764 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1765 ieee80211_free_txskb(hw, skb2); 1766 ieee80211_purge_tx_queue(hw, &tx.skbs); 1767 return false; 1768 } 1769 1770 return true; 1771 } 1772 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1773 1774 /* 1775 * Returns false if the frame couldn't be transmitted but was queued instead. 1776 */ 1777 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1778 struct sta_info *sta, struct sk_buff *skb, 1779 bool txpending) 1780 { 1781 struct ieee80211_local *local = sdata->local; 1782 struct ieee80211_tx_data tx; 1783 ieee80211_tx_result res_prepare; 1784 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1785 bool result = true; 1786 int led_len; 1787 1788 if (unlikely(skb->len < 10)) { 1789 dev_kfree_skb(skb); 1790 return true; 1791 } 1792 1793 /* initialises tx */ 1794 led_len = skb->len; 1795 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1796 1797 if (unlikely(res_prepare == TX_DROP)) { 1798 ieee80211_free_txskb(&local->hw, skb); 1799 return true; 1800 } else if (unlikely(res_prepare == TX_QUEUED)) { 1801 return true; 1802 } 1803 1804 /* set up hw_queue value early */ 1805 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1806 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1807 info->hw_queue = 1808 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1809 1810 if (!invoke_tx_handlers(&tx)) 1811 result = __ieee80211_tx(local, &tx.skbs, led_len, 1812 tx.sta, txpending); 1813 1814 return result; 1815 } 1816 1817 /* device xmit handlers */ 1818 1819 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1820 struct sk_buff *skb, 1821 int head_need, bool may_encrypt) 1822 { 1823 struct ieee80211_local *local = sdata->local; 1824 int tail_need = 0; 1825 1826 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1827 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1828 tail_need -= skb_tailroom(skb); 1829 tail_need = max_t(int, tail_need, 0); 1830 } 1831 1832 if (skb_cloned(skb) && 1833 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1834 !skb_clone_writable(skb, ETH_HLEN) || 1835 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1836 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1837 else if (head_need || tail_need) 1838 I802_DEBUG_INC(local->tx_expand_skb_head); 1839 else 1840 return 0; 1841 1842 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1843 wiphy_debug(local->hw.wiphy, 1844 "failed to reallocate TX buffer\n"); 1845 return -ENOMEM; 1846 } 1847 1848 return 0; 1849 } 1850 1851 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1852 struct sta_info *sta, struct sk_buff *skb) 1853 { 1854 struct ieee80211_local *local = sdata->local; 1855 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1856 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1857 int headroom; 1858 bool may_encrypt; 1859 1860 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1861 1862 headroom = local->tx_headroom; 1863 if (may_encrypt) 1864 headroom += sdata->encrypt_headroom; 1865 headroom -= skb_headroom(skb); 1866 headroom = max_t(int, 0, headroom); 1867 1868 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1869 ieee80211_free_txskb(&local->hw, skb); 1870 return; 1871 } 1872 1873 hdr = (struct ieee80211_hdr *) skb->data; 1874 info->control.vif = &sdata->vif; 1875 1876 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1877 if (ieee80211_is_data(hdr->frame_control) && 1878 is_unicast_ether_addr(hdr->addr1)) { 1879 if (mesh_nexthop_resolve(sdata, skb)) 1880 return; /* skb queued: don't free */ 1881 } else { 1882 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1883 } 1884 } 1885 1886 ieee80211_set_qos_hdr(sdata, skb); 1887 ieee80211_tx(sdata, sta, skb, false); 1888 } 1889 1890 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1891 struct sk_buff *skb) 1892 { 1893 struct ieee80211_radiotap_iterator iterator; 1894 struct ieee80211_radiotap_header *rthdr = 1895 (struct ieee80211_radiotap_header *) skb->data; 1896 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1897 struct ieee80211_supported_band *sband = 1898 local->hw.wiphy->bands[info->band]; 1899 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1900 NULL); 1901 u16 txflags; 1902 u16 rate = 0; 1903 bool rate_found = false; 1904 u8 rate_retries = 0; 1905 u16 rate_flags = 0; 1906 u8 mcs_known, mcs_flags, mcs_bw; 1907 u16 vht_known; 1908 u8 vht_mcs = 0, vht_nss = 0; 1909 int i; 1910 1911 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1912 IEEE80211_TX_CTL_DONTFRAG; 1913 1914 /* 1915 * for every radiotap entry that is present 1916 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1917 * entries present, or -EINVAL on error) 1918 */ 1919 1920 while (!ret) { 1921 ret = ieee80211_radiotap_iterator_next(&iterator); 1922 1923 if (ret) 1924 continue; 1925 1926 /* see if this argument is something we can use */ 1927 switch (iterator.this_arg_index) { 1928 /* 1929 * You must take care when dereferencing iterator.this_arg 1930 * for multibyte types... the pointer is not aligned. Use 1931 * get_unaligned((type *)iterator.this_arg) to dereference 1932 * iterator.this_arg for type "type" safely on all arches. 1933 */ 1934 case IEEE80211_RADIOTAP_FLAGS: 1935 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1936 /* 1937 * this indicates that the skb we have been 1938 * handed has the 32-bit FCS CRC at the end... 1939 * we should react to that by snipping it off 1940 * because it will be recomputed and added 1941 * on transmission 1942 */ 1943 if (skb->len < (iterator._max_length + FCS_LEN)) 1944 return false; 1945 1946 skb_trim(skb, skb->len - FCS_LEN); 1947 } 1948 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1949 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1950 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1951 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1952 break; 1953 1954 case IEEE80211_RADIOTAP_TX_FLAGS: 1955 txflags = get_unaligned_le16(iterator.this_arg); 1956 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1957 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1958 break; 1959 1960 case IEEE80211_RADIOTAP_RATE: 1961 rate = *iterator.this_arg; 1962 rate_flags = 0; 1963 rate_found = true; 1964 break; 1965 1966 case IEEE80211_RADIOTAP_DATA_RETRIES: 1967 rate_retries = *iterator.this_arg; 1968 break; 1969 1970 case IEEE80211_RADIOTAP_MCS: 1971 mcs_known = iterator.this_arg[0]; 1972 mcs_flags = iterator.this_arg[1]; 1973 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 1974 break; 1975 1976 rate_found = true; 1977 rate = iterator.this_arg[2]; 1978 rate_flags = IEEE80211_TX_RC_MCS; 1979 1980 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 1981 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 1982 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 1983 1984 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 1985 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 1986 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 1987 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 1988 break; 1989 1990 case IEEE80211_RADIOTAP_VHT: 1991 vht_known = get_unaligned_le16(iterator.this_arg); 1992 rate_found = true; 1993 1994 rate_flags = IEEE80211_TX_RC_VHT_MCS; 1995 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 1996 (iterator.this_arg[2] & 1997 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 1998 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 1999 if (vht_known & 2000 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2001 if (iterator.this_arg[3] == 1) 2002 rate_flags |= 2003 IEEE80211_TX_RC_40_MHZ_WIDTH; 2004 else if (iterator.this_arg[3] == 4) 2005 rate_flags |= 2006 IEEE80211_TX_RC_80_MHZ_WIDTH; 2007 else if (iterator.this_arg[3] == 11) 2008 rate_flags |= 2009 IEEE80211_TX_RC_160_MHZ_WIDTH; 2010 } 2011 2012 vht_mcs = iterator.this_arg[4] >> 4; 2013 vht_nss = iterator.this_arg[4] & 0xF; 2014 break; 2015 2016 /* 2017 * Please update the file 2018 * Documentation/networking/mac80211-injection.txt 2019 * when parsing new fields here. 2020 */ 2021 2022 default: 2023 break; 2024 } 2025 } 2026 2027 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2028 return false; 2029 2030 if (rate_found) { 2031 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2032 2033 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2034 info->control.rates[i].idx = -1; 2035 info->control.rates[i].flags = 0; 2036 info->control.rates[i].count = 0; 2037 } 2038 2039 if (rate_flags & IEEE80211_TX_RC_MCS) { 2040 info->control.rates[0].idx = rate; 2041 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2042 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2043 vht_nss); 2044 } else { 2045 for (i = 0; i < sband->n_bitrates; i++) { 2046 if (rate * 5 != sband->bitrates[i].bitrate) 2047 continue; 2048 2049 info->control.rates[0].idx = i; 2050 break; 2051 } 2052 } 2053 2054 if (info->control.rates[0].idx < 0) 2055 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2056 2057 info->control.rates[0].flags = rate_flags; 2058 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2059 local->hw.max_rate_tries); 2060 } 2061 2062 /* 2063 * remove the radiotap header 2064 * iterator->_max_length was sanity-checked against 2065 * skb->len by iterator init 2066 */ 2067 skb_pull(skb, iterator._max_length); 2068 2069 return true; 2070 } 2071 2072 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2073 struct net_device *dev) 2074 { 2075 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2076 struct ieee80211_chanctx_conf *chanctx_conf; 2077 struct ieee80211_radiotap_header *prthdr = 2078 (struct ieee80211_radiotap_header *)skb->data; 2079 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2080 struct ieee80211_hdr *hdr; 2081 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2082 struct cfg80211_chan_def *chandef; 2083 u16 len_rthdr; 2084 int hdrlen; 2085 2086 /* check for not even having the fixed radiotap header part */ 2087 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2088 goto fail; /* too short to be possibly valid */ 2089 2090 /* is it a header version we can trust to find length from? */ 2091 if (unlikely(prthdr->it_version)) 2092 goto fail; /* only version 0 is supported */ 2093 2094 /* then there must be a radiotap header with a length we can use */ 2095 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2096 2097 /* does the skb contain enough to deliver on the alleged length? */ 2098 if (unlikely(skb->len < len_rthdr)) 2099 goto fail; /* skb too short for claimed rt header extent */ 2100 2101 /* 2102 * fix up the pointers accounting for the radiotap 2103 * header still being in there. We are being given 2104 * a precooked IEEE80211 header so no need for 2105 * normal processing 2106 */ 2107 skb_set_mac_header(skb, len_rthdr); 2108 /* 2109 * these are just fixed to the end of the rt area since we 2110 * don't have any better information and at this point, nobody cares 2111 */ 2112 skb_set_network_header(skb, len_rthdr); 2113 skb_set_transport_header(skb, len_rthdr); 2114 2115 if (skb->len < len_rthdr + 2) 2116 goto fail; 2117 2118 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2119 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2120 2121 if (skb->len < len_rthdr + hdrlen) 2122 goto fail; 2123 2124 /* 2125 * Initialize skb->protocol if the injected frame is a data frame 2126 * carrying a rfc1042 header 2127 */ 2128 if (ieee80211_is_data(hdr->frame_control) && 2129 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2130 u8 *payload = (u8 *)hdr + hdrlen; 2131 2132 if (ether_addr_equal(payload, rfc1042_header)) 2133 skb->protocol = cpu_to_be16((payload[6] << 8) | 2134 payload[7]); 2135 } 2136 2137 memset(info, 0, sizeof(*info)); 2138 2139 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2140 IEEE80211_TX_CTL_INJECTED; 2141 2142 rcu_read_lock(); 2143 2144 /* 2145 * We process outgoing injected frames that have a local address 2146 * we handle as though they are non-injected frames. 2147 * This code here isn't entirely correct, the local MAC address 2148 * isn't always enough to find the interface to use; for proper 2149 * VLAN/WDS support we will need a different mechanism (which 2150 * likely isn't going to be monitor interfaces). 2151 */ 2152 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2153 2154 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2155 if (!ieee80211_sdata_running(tmp_sdata)) 2156 continue; 2157 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2158 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2159 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2160 continue; 2161 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2162 sdata = tmp_sdata; 2163 break; 2164 } 2165 } 2166 2167 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2168 if (!chanctx_conf) { 2169 tmp_sdata = rcu_dereference(local->monitor_sdata); 2170 if (tmp_sdata) 2171 chanctx_conf = 2172 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2173 } 2174 2175 if (chanctx_conf) 2176 chandef = &chanctx_conf->def; 2177 else if (!local->use_chanctx) 2178 chandef = &local->_oper_chandef; 2179 else 2180 goto fail_rcu; 2181 2182 /* 2183 * Frame injection is not allowed if beaconing is not allowed 2184 * or if we need radar detection. Beaconing is usually not allowed when 2185 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2186 * Passive scan is also used in world regulatory domains where 2187 * your country is not known and as such it should be treated as 2188 * NO TX unless the channel is explicitly allowed in which case 2189 * your current regulatory domain would not have the passive scan 2190 * flag. 2191 * 2192 * Since AP mode uses monitor interfaces to inject/TX management 2193 * frames we can make AP mode the exception to this rule once it 2194 * supports radar detection as its implementation can deal with 2195 * radar detection by itself. We can do that later by adding a 2196 * monitor flag interfaces used for AP support. 2197 */ 2198 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2199 sdata->vif.type)) 2200 goto fail_rcu; 2201 2202 info->band = chandef->chan->band; 2203 2204 /* process and remove the injection radiotap header */ 2205 if (!ieee80211_parse_tx_radiotap(local, skb)) 2206 goto fail_rcu; 2207 2208 ieee80211_xmit(sdata, NULL, skb); 2209 rcu_read_unlock(); 2210 2211 return NETDEV_TX_OK; 2212 2213 fail_rcu: 2214 rcu_read_unlock(); 2215 fail: 2216 dev_kfree_skb(skb); 2217 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2218 } 2219 2220 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2221 { 2222 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2223 2224 return ethertype == ETH_P_TDLS && 2225 skb->len > 14 && 2226 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2227 } 2228 2229 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2230 struct sk_buff *skb, 2231 struct sta_info **sta_out) 2232 { 2233 struct sta_info *sta; 2234 2235 switch (sdata->vif.type) { 2236 case NL80211_IFTYPE_AP_VLAN: 2237 sta = rcu_dereference(sdata->u.vlan.sta); 2238 if (sta) { 2239 *sta_out = sta; 2240 return 0; 2241 } else if (sdata->wdev.use_4addr) { 2242 return -ENOLINK; 2243 } 2244 /* fall through */ 2245 case NL80211_IFTYPE_AP: 2246 case NL80211_IFTYPE_OCB: 2247 case NL80211_IFTYPE_ADHOC: 2248 if (is_multicast_ether_addr(skb->data)) { 2249 *sta_out = ERR_PTR(-ENOENT); 2250 return 0; 2251 } 2252 sta = sta_info_get_bss(sdata, skb->data); 2253 break; 2254 case NL80211_IFTYPE_WDS: 2255 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2256 break; 2257 #ifdef CONFIG_MAC80211_MESH 2258 case NL80211_IFTYPE_MESH_POINT: 2259 /* determined much later */ 2260 *sta_out = NULL; 2261 return 0; 2262 #endif 2263 case NL80211_IFTYPE_STATION: 2264 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2265 sta = sta_info_get(sdata, skb->data); 2266 if (sta) { 2267 bool tdls_peer, tdls_auth; 2268 2269 tdls_peer = test_sta_flag(sta, 2270 WLAN_STA_TDLS_PEER); 2271 tdls_auth = test_sta_flag(sta, 2272 WLAN_STA_TDLS_PEER_AUTH); 2273 2274 if (tdls_peer && tdls_auth) { 2275 *sta_out = sta; 2276 return 0; 2277 } 2278 2279 /* 2280 * TDLS link during setup - throw out frames to 2281 * peer. Allow TDLS-setup frames to unauthorized 2282 * peers for the special case of a link teardown 2283 * after a TDLS sta is removed due to being 2284 * unreachable. 2285 */ 2286 if (tdls_peer && !tdls_auth && 2287 !ieee80211_is_tdls_setup(skb)) 2288 return -EINVAL; 2289 } 2290 2291 } 2292 2293 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2294 if (!sta) 2295 return -ENOLINK; 2296 break; 2297 default: 2298 return -EINVAL; 2299 } 2300 2301 *sta_out = sta ?: ERR_PTR(-ENOENT); 2302 return 0; 2303 } 2304 2305 /** 2306 * ieee80211_build_hdr - build 802.11 header in the given frame 2307 * @sdata: virtual interface to build the header for 2308 * @skb: the skb to build the header in 2309 * @info_flags: skb flags to set 2310 * 2311 * This function takes the skb with 802.3 header and reformats the header to 2312 * the appropriate IEEE 802.11 header based on which interface the packet is 2313 * being transmitted on. 2314 * 2315 * Note that this function also takes care of the TX status request and 2316 * potential unsharing of the SKB - this needs to be interleaved with the 2317 * header building. 2318 * 2319 * The function requires the read-side RCU lock held 2320 * 2321 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2322 */ 2323 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2324 struct sk_buff *skb, u32 info_flags, 2325 struct sta_info *sta) 2326 { 2327 struct ieee80211_local *local = sdata->local; 2328 struct ieee80211_tx_info *info; 2329 int head_need; 2330 u16 ethertype, hdrlen, meshhdrlen = 0; 2331 __le16 fc; 2332 struct ieee80211_hdr hdr; 2333 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2334 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2335 const u8 *encaps_data; 2336 int encaps_len, skip_header_bytes; 2337 bool wme_sta = false, authorized = false; 2338 bool tdls_peer; 2339 bool multicast; 2340 u16 info_id = 0; 2341 struct ieee80211_chanctx_conf *chanctx_conf; 2342 struct ieee80211_sub_if_data *ap_sdata; 2343 enum nl80211_band band; 2344 int ret; 2345 2346 if (IS_ERR(sta)) 2347 sta = NULL; 2348 2349 /* convert Ethernet header to proper 802.11 header (based on 2350 * operation mode) */ 2351 ethertype = (skb->data[12] << 8) | skb->data[13]; 2352 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2353 2354 switch (sdata->vif.type) { 2355 case NL80211_IFTYPE_AP_VLAN: 2356 if (sdata->wdev.use_4addr) { 2357 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2358 /* RA TA DA SA */ 2359 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2360 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2361 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2362 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2363 hdrlen = 30; 2364 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2365 wme_sta = sta->sta.wme; 2366 } 2367 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2368 u.ap); 2369 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2370 if (!chanctx_conf) { 2371 ret = -ENOTCONN; 2372 goto free; 2373 } 2374 band = chanctx_conf->def.chan->band; 2375 if (sdata->wdev.use_4addr) 2376 break; 2377 /* fall through */ 2378 case NL80211_IFTYPE_AP: 2379 if (sdata->vif.type == NL80211_IFTYPE_AP) 2380 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2381 if (!chanctx_conf) { 2382 ret = -ENOTCONN; 2383 goto free; 2384 } 2385 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2386 /* DA BSSID SA */ 2387 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2388 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2389 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2390 hdrlen = 24; 2391 band = chanctx_conf->def.chan->band; 2392 break; 2393 case NL80211_IFTYPE_WDS: 2394 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2395 /* RA TA DA SA */ 2396 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2397 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2398 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2399 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2400 hdrlen = 30; 2401 /* 2402 * This is the exception! WDS style interfaces are prohibited 2403 * when channel contexts are in used so this must be valid 2404 */ 2405 band = local->hw.conf.chandef.chan->band; 2406 break; 2407 #ifdef CONFIG_MAC80211_MESH 2408 case NL80211_IFTYPE_MESH_POINT: 2409 if (!is_multicast_ether_addr(skb->data)) { 2410 struct sta_info *next_hop; 2411 bool mpp_lookup = true; 2412 2413 mpath = mesh_path_lookup(sdata, skb->data); 2414 if (mpath) { 2415 mpp_lookup = false; 2416 next_hop = rcu_dereference(mpath->next_hop); 2417 if (!next_hop || 2418 !(mpath->flags & (MESH_PATH_ACTIVE | 2419 MESH_PATH_RESOLVING))) 2420 mpp_lookup = true; 2421 } 2422 2423 if (mpp_lookup) { 2424 mppath = mpp_path_lookup(sdata, skb->data); 2425 if (mppath) 2426 mppath->exp_time = jiffies; 2427 } 2428 2429 if (mppath && mpath) 2430 mesh_path_del(sdata, mpath->dst); 2431 } 2432 2433 /* 2434 * Use address extension if it is a packet from 2435 * another interface or if we know the destination 2436 * is being proxied by a portal (i.e. portal address 2437 * differs from proxied address) 2438 */ 2439 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2440 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2441 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2442 skb->data, skb->data + ETH_ALEN); 2443 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2444 NULL, NULL); 2445 } else { 2446 /* DS -> MBSS (802.11-2012 13.11.3.3). 2447 * For unicast with unknown forwarding information, 2448 * destination might be in the MBSS or if that fails 2449 * forwarded to another mesh gate. In either case 2450 * resolution will be handled in ieee80211_xmit(), so 2451 * leave the original DA. This also works for mcast */ 2452 const u8 *mesh_da = skb->data; 2453 2454 if (mppath) 2455 mesh_da = mppath->mpp; 2456 else if (mpath) 2457 mesh_da = mpath->dst; 2458 2459 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2460 mesh_da, sdata->vif.addr); 2461 if (is_multicast_ether_addr(mesh_da)) 2462 /* DA TA mSA AE:SA */ 2463 meshhdrlen = ieee80211_new_mesh_header( 2464 sdata, &mesh_hdr, 2465 skb->data + ETH_ALEN, NULL); 2466 else 2467 /* RA TA mDA mSA AE:DA SA */ 2468 meshhdrlen = ieee80211_new_mesh_header( 2469 sdata, &mesh_hdr, skb->data, 2470 skb->data + ETH_ALEN); 2471 2472 } 2473 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2474 if (!chanctx_conf) { 2475 ret = -ENOTCONN; 2476 goto free; 2477 } 2478 band = chanctx_conf->def.chan->band; 2479 break; 2480 #endif 2481 case NL80211_IFTYPE_STATION: 2482 /* we already did checks when looking up the RA STA */ 2483 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2484 2485 if (tdls_peer) { 2486 /* DA SA BSSID */ 2487 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2488 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2489 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2490 hdrlen = 24; 2491 } else if (sdata->u.mgd.use_4addr && 2492 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2493 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2494 IEEE80211_FCTL_TODS); 2495 /* RA TA DA SA */ 2496 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2497 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2498 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2499 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2500 hdrlen = 30; 2501 } else { 2502 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2503 /* BSSID SA DA */ 2504 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2505 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2506 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2507 hdrlen = 24; 2508 } 2509 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2510 if (!chanctx_conf) { 2511 ret = -ENOTCONN; 2512 goto free; 2513 } 2514 band = chanctx_conf->def.chan->band; 2515 break; 2516 case NL80211_IFTYPE_OCB: 2517 /* DA SA BSSID */ 2518 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2519 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2520 eth_broadcast_addr(hdr.addr3); 2521 hdrlen = 24; 2522 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2523 if (!chanctx_conf) { 2524 ret = -ENOTCONN; 2525 goto free; 2526 } 2527 band = chanctx_conf->def.chan->band; 2528 break; 2529 case NL80211_IFTYPE_ADHOC: 2530 /* DA SA BSSID */ 2531 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2532 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2533 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2534 hdrlen = 24; 2535 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2536 if (!chanctx_conf) { 2537 ret = -ENOTCONN; 2538 goto free; 2539 } 2540 band = chanctx_conf->def.chan->band; 2541 break; 2542 default: 2543 ret = -EINVAL; 2544 goto free; 2545 } 2546 2547 multicast = is_multicast_ether_addr(hdr.addr1); 2548 2549 /* sta is always NULL for mesh */ 2550 if (sta) { 2551 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2552 wme_sta = sta->sta.wme; 2553 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2554 /* For mesh, the use of the QoS header is mandatory */ 2555 wme_sta = true; 2556 } 2557 2558 /* receiver does QoS (which also means we do) use it */ 2559 if (wme_sta) { 2560 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2561 hdrlen += 2; 2562 } 2563 2564 /* 2565 * Drop unicast frames to unauthorised stations unless they are 2566 * EAPOL frames from the local station. 2567 */ 2568 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2569 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2570 !multicast && !authorized && 2571 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2572 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2573 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2574 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2575 sdata->name, hdr.addr1); 2576 #endif 2577 2578 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2579 2580 ret = -EPERM; 2581 goto free; 2582 } 2583 2584 if (unlikely(!multicast && skb->sk && 2585 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2586 struct sk_buff *ack_skb = skb_clone_sk(skb); 2587 2588 if (ack_skb) { 2589 unsigned long flags; 2590 int id; 2591 2592 spin_lock_irqsave(&local->ack_status_lock, flags); 2593 id = idr_alloc(&local->ack_status_frames, ack_skb, 2594 1, 0x10000, GFP_ATOMIC); 2595 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2596 2597 if (id >= 0) { 2598 info_id = id; 2599 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2600 } else { 2601 kfree_skb(ack_skb); 2602 } 2603 } 2604 } 2605 2606 /* 2607 * If the skb is shared we need to obtain our own copy. 2608 */ 2609 if (skb_shared(skb)) { 2610 struct sk_buff *tmp_skb = skb; 2611 2612 /* can't happen -- skb is a clone if info_id != 0 */ 2613 WARN_ON(info_id); 2614 2615 skb = skb_clone(skb, GFP_ATOMIC); 2616 kfree_skb(tmp_skb); 2617 2618 if (!skb) { 2619 ret = -ENOMEM; 2620 goto free; 2621 } 2622 } 2623 2624 hdr.frame_control = fc; 2625 hdr.duration_id = 0; 2626 hdr.seq_ctrl = 0; 2627 2628 skip_header_bytes = ETH_HLEN; 2629 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2630 encaps_data = bridge_tunnel_header; 2631 encaps_len = sizeof(bridge_tunnel_header); 2632 skip_header_bytes -= 2; 2633 } else if (ethertype >= ETH_P_802_3_MIN) { 2634 encaps_data = rfc1042_header; 2635 encaps_len = sizeof(rfc1042_header); 2636 skip_header_bytes -= 2; 2637 } else { 2638 encaps_data = NULL; 2639 encaps_len = 0; 2640 } 2641 2642 skb_pull(skb, skip_header_bytes); 2643 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2644 2645 /* 2646 * So we need to modify the skb header and hence need a copy of 2647 * that. The head_need variable above doesn't, so far, include 2648 * the needed header space that we don't need right away. If we 2649 * can, then we don't reallocate right now but only after the 2650 * frame arrives at the master device (if it does...) 2651 * 2652 * If we cannot, however, then we will reallocate to include all 2653 * the ever needed space. Also, if we need to reallocate it anyway, 2654 * make it big enough for everything we may ever need. 2655 */ 2656 2657 if (head_need > 0 || skb_cloned(skb)) { 2658 head_need += sdata->encrypt_headroom; 2659 head_need += local->tx_headroom; 2660 head_need = max_t(int, 0, head_need); 2661 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2662 ieee80211_free_txskb(&local->hw, skb); 2663 skb = NULL; 2664 return ERR_PTR(-ENOMEM); 2665 } 2666 } 2667 2668 if (encaps_data) 2669 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2670 2671 #ifdef CONFIG_MAC80211_MESH 2672 if (meshhdrlen > 0) 2673 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2674 #endif 2675 2676 if (ieee80211_is_data_qos(fc)) { 2677 __le16 *qos_control; 2678 2679 qos_control = (__le16 *) skb_push(skb, 2); 2680 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2681 /* 2682 * Maybe we could actually set some fields here, for now just 2683 * initialise to zero to indicate no special operation. 2684 */ 2685 *qos_control = 0; 2686 } else 2687 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2688 2689 skb_reset_mac_header(skb); 2690 2691 info = IEEE80211_SKB_CB(skb); 2692 memset(info, 0, sizeof(*info)); 2693 2694 info->flags = info_flags; 2695 info->ack_frame_id = info_id; 2696 info->band = band; 2697 2698 return skb; 2699 free: 2700 kfree_skb(skb); 2701 return ERR_PTR(ret); 2702 } 2703 2704 /* 2705 * fast-xmit overview 2706 * 2707 * The core idea of this fast-xmit is to remove per-packet checks by checking 2708 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2709 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2710 * much less work can be done per packet. For example, fragmentation must be 2711 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2712 * in the code here. 2713 * 2714 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2715 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2716 * 2717 * The most difficult part of this is that when any of these assumptions 2718 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2719 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2720 * since the per-packet code no longer checks the conditions. This is reflected 2721 * by the calls to these functions throughout the rest of the code, and must be 2722 * maintained if any of the TX path checks change. 2723 */ 2724 2725 void ieee80211_check_fast_xmit(struct sta_info *sta) 2726 { 2727 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2728 struct ieee80211_local *local = sta->local; 2729 struct ieee80211_sub_if_data *sdata = sta->sdata; 2730 struct ieee80211_hdr *hdr = (void *)build.hdr; 2731 struct ieee80211_chanctx_conf *chanctx_conf; 2732 __le16 fc; 2733 2734 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2735 return; 2736 2737 /* Locking here protects both the pointer itself, and against concurrent 2738 * invocations winning data access races to, e.g., the key pointer that 2739 * is used. 2740 * Without it, the invocation of this function right after the key 2741 * pointer changes wouldn't be sufficient, as another CPU could access 2742 * the pointer, then stall, and then do the cache update after the CPU 2743 * that invalidated the key. 2744 * With the locking, such scenarios cannot happen as the check for the 2745 * key and the fast-tx assignment are done atomically, so the CPU that 2746 * modifies the key will either wait or other one will see the key 2747 * cleared/changed already. 2748 */ 2749 spin_lock_bh(&sta->lock); 2750 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2751 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2752 sdata->vif.type == NL80211_IFTYPE_STATION) 2753 goto out; 2754 2755 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2756 goto out; 2757 2758 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2759 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2760 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2761 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2762 goto out; 2763 2764 if (sdata->noack_map) 2765 goto out; 2766 2767 /* fast-xmit doesn't handle fragmentation at all */ 2768 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2769 !local->ops->set_frag_threshold) 2770 goto out; 2771 2772 rcu_read_lock(); 2773 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2774 if (!chanctx_conf) { 2775 rcu_read_unlock(); 2776 goto out; 2777 } 2778 build.band = chanctx_conf->def.chan->band; 2779 rcu_read_unlock(); 2780 2781 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2782 2783 switch (sdata->vif.type) { 2784 case NL80211_IFTYPE_ADHOC: 2785 /* DA SA BSSID */ 2786 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2787 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2788 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2789 build.hdr_len = 24; 2790 break; 2791 case NL80211_IFTYPE_STATION: 2792 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2793 /* DA SA BSSID */ 2794 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2795 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2796 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2797 build.hdr_len = 24; 2798 break; 2799 } 2800 2801 if (sdata->u.mgd.use_4addr) { 2802 /* non-regular ethertype cannot use the fastpath */ 2803 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2804 IEEE80211_FCTL_TODS); 2805 /* RA TA DA SA */ 2806 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2807 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2808 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2809 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2810 build.hdr_len = 30; 2811 break; 2812 } 2813 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2814 /* BSSID SA DA */ 2815 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2816 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2817 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2818 build.hdr_len = 24; 2819 break; 2820 case NL80211_IFTYPE_AP_VLAN: 2821 if (sdata->wdev.use_4addr) { 2822 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2823 IEEE80211_FCTL_TODS); 2824 /* RA TA DA SA */ 2825 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2826 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2827 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2828 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2829 build.hdr_len = 30; 2830 break; 2831 } 2832 /* fall through */ 2833 case NL80211_IFTYPE_AP: 2834 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2835 /* DA BSSID SA */ 2836 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2837 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2838 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2839 build.hdr_len = 24; 2840 break; 2841 default: 2842 /* not handled on fast-xmit */ 2843 goto out; 2844 } 2845 2846 if (sta->sta.wme) { 2847 build.hdr_len += 2; 2848 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2849 } 2850 2851 /* We store the key here so there's no point in using rcu_dereference() 2852 * but that's fine because the code that changes the pointers will call 2853 * this function after doing so. For a single CPU that would be enough, 2854 * for multiple see the comment above. 2855 */ 2856 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2857 if (!build.key) 2858 build.key = rcu_access_pointer(sdata->default_unicast_key); 2859 if (build.key) { 2860 bool gen_iv, iv_spc, mmic; 2861 2862 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2863 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2864 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC; 2865 2866 /* don't handle software crypto */ 2867 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2868 goto out; 2869 2870 switch (build.key->conf.cipher) { 2871 case WLAN_CIPHER_SUITE_CCMP: 2872 case WLAN_CIPHER_SUITE_CCMP_256: 2873 /* add fixed key ID */ 2874 if (gen_iv) { 2875 (build.hdr + build.hdr_len)[3] = 2876 0x20 | (build.key->conf.keyidx << 6); 2877 build.pn_offs = build.hdr_len; 2878 } 2879 if (gen_iv || iv_spc) 2880 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2881 break; 2882 case WLAN_CIPHER_SUITE_GCMP: 2883 case WLAN_CIPHER_SUITE_GCMP_256: 2884 /* add fixed key ID */ 2885 if (gen_iv) { 2886 (build.hdr + build.hdr_len)[3] = 2887 0x20 | (build.key->conf.keyidx << 6); 2888 build.pn_offs = build.hdr_len; 2889 } 2890 if (gen_iv || iv_spc) 2891 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2892 break; 2893 case WLAN_CIPHER_SUITE_TKIP: 2894 /* cannot handle MMIC or IV generation in xmit-fast */ 2895 if (mmic || gen_iv) 2896 goto out; 2897 if (iv_spc) 2898 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2899 break; 2900 case WLAN_CIPHER_SUITE_WEP40: 2901 case WLAN_CIPHER_SUITE_WEP104: 2902 /* cannot handle IV generation in fast-xmit */ 2903 if (gen_iv) 2904 goto out; 2905 if (iv_spc) 2906 build.hdr_len += IEEE80211_WEP_IV_LEN; 2907 break; 2908 case WLAN_CIPHER_SUITE_AES_CMAC: 2909 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2910 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2911 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2912 WARN(1, 2913 "management cipher suite 0x%x enabled for data\n", 2914 build.key->conf.cipher); 2915 goto out; 2916 default: 2917 /* we don't know how to generate IVs for this at all */ 2918 if (WARN_ON(gen_iv)) 2919 goto out; 2920 /* pure hardware keys are OK, of course */ 2921 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2922 break; 2923 /* cipher scheme might require space allocation */ 2924 if (iv_spc && 2925 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2926 goto out; 2927 if (iv_spc) 2928 build.hdr_len += build.key->conf.iv_len; 2929 } 2930 2931 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2932 } 2933 2934 hdr->frame_control = fc; 2935 2936 memcpy(build.hdr + build.hdr_len, 2937 rfc1042_header, sizeof(rfc1042_header)); 2938 build.hdr_len += sizeof(rfc1042_header); 2939 2940 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2941 /* if the kmemdup fails, continue w/o fast_tx */ 2942 if (!fast_tx) 2943 goto out; 2944 2945 out: 2946 /* we might have raced against another call to this function */ 2947 old = rcu_dereference_protected(sta->fast_tx, 2948 lockdep_is_held(&sta->lock)); 2949 rcu_assign_pointer(sta->fast_tx, fast_tx); 2950 if (old) 2951 kfree_rcu(old, rcu_head); 2952 spin_unlock_bh(&sta->lock); 2953 } 2954 2955 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 2956 { 2957 struct sta_info *sta; 2958 2959 rcu_read_lock(); 2960 list_for_each_entry_rcu(sta, &local->sta_list, list) 2961 ieee80211_check_fast_xmit(sta); 2962 rcu_read_unlock(); 2963 } 2964 2965 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 2966 { 2967 struct ieee80211_local *local = sdata->local; 2968 struct sta_info *sta; 2969 2970 rcu_read_lock(); 2971 2972 list_for_each_entry_rcu(sta, &local->sta_list, list) { 2973 if (sdata != sta->sdata && 2974 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 2975 continue; 2976 ieee80211_check_fast_xmit(sta); 2977 } 2978 2979 rcu_read_unlock(); 2980 } 2981 2982 void ieee80211_clear_fast_xmit(struct sta_info *sta) 2983 { 2984 struct ieee80211_fast_tx *fast_tx; 2985 2986 spin_lock_bh(&sta->lock); 2987 fast_tx = rcu_dereference_protected(sta->fast_tx, 2988 lockdep_is_held(&sta->lock)); 2989 RCU_INIT_POINTER(sta->fast_tx, NULL); 2990 spin_unlock_bh(&sta->lock); 2991 2992 if (fast_tx) 2993 kfree_rcu(fast_tx, rcu_head); 2994 } 2995 2996 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 2997 struct sk_buff *skb, int headroom, 2998 int *subframe_len) 2999 { 3000 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3001 int padding = (4 - amsdu_len) & 3; 3002 3003 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3004 I802_DEBUG_INC(local->tx_expand_skb_head); 3005 3006 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3007 wiphy_debug(local->hw.wiphy, 3008 "failed to reallocate TX buffer\n"); 3009 return false; 3010 } 3011 } 3012 3013 if (padding) { 3014 *subframe_len += padding; 3015 memset(skb_put(skb, padding), 0, padding); 3016 } 3017 3018 return true; 3019 } 3020 3021 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3022 struct ieee80211_fast_tx *fast_tx, 3023 struct sk_buff *skb) 3024 { 3025 struct ieee80211_local *local = sdata->local; 3026 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3027 struct ieee80211_hdr *hdr; 3028 struct ethhdr amsdu_hdr; 3029 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3030 int subframe_len = skb->len - hdr_len; 3031 void *data; 3032 u8 *qc; 3033 3034 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3035 return false; 3036 3037 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3038 return true; 3039 3040 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr), 3041 &subframe_len)) 3042 return false; 3043 3044 amsdu_hdr.h_proto = cpu_to_be16(subframe_len); 3045 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN); 3046 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN); 3047 3048 data = skb_push(skb, sizeof(amsdu_hdr)); 3049 memmove(data, data + sizeof(amsdu_hdr), hdr_len); 3050 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr)); 3051 3052 hdr = data; 3053 qc = ieee80211_get_qos_ctl(hdr); 3054 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3055 3056 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3057 3058 return true; 3059 } 3060 3061 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3062 struct sta_info *sta, 3063 struct ieee80211_fast_tx *fast_tx, 3064 struct sk_buff *skb) 3065 { 3066 struct ieee80211_local *local = sdata->local; 3067 struct fq *fq = &local->fq; 3068 struct fq_tin *tin; 3069 struct fq_flow *flow; 3070 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3071 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3072 struct txq_info *txqi; 3073 struct sk_buff **frag_tail, *head; 3074 int subframe_len = skb->len - ETH_ALEN; 3075 u8 max_subframes = sta->sta.max_amsdu_subframes; 3076 int max_frags = local->hw.max_tx_fragments; 3077 int max_amsdu_len = sta->sta.max_amsdu_len; 3078 __be16 len; 3079 void *data; 3080 bool ret = false; 3081 unsigned int orig_len; 3082 int n = 1, nfrags; 3083 3084 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3085 return false; 3086 3087 if (!txq) 3088 return false; 3089 3090 txqi = to_txq_info(txq); 3091 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3092 return false; 3093 3094 if (sta->sta.max_rc_amsdu_len) 3095 max_amsdu_len = min_t(int, max_amsdu_len, 3096 sta->sta.max_rc_amsdu_len); 3097 3098 spin_lock_bh(&fq->lock); 3099 3100 /* TODO: Ideally aggregation should be done on dequeue to remain 3101 * responsive to environment changes. 3102 */ 3103 3104 tin = &txqi->tin; 3105 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3106 head = skb_peek_tail(&flow->queue); 3107 if (!head) 3108 goto out; 3109 3110 orig_len = head->len; 3111 3112 if (skb->len + head->len > max_amsdu_len) 3113 goto out; 3114 3115 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3116 goto out; 3117 3118 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3119 nfrags += 1 + skb_shinfo(head)->nr_frags; 3120 frag_tail = &skb_shinfo(head)->frag_list; 3121 while (*frag_tail) { 3122 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3123 frag_tail = &(*frag_tail)->next; 3124 n++; 3125 } 3126 3127 if (max_subframes && n > max_subframes) 3128 goto out; 3129 3130 if (max_frags && nfrags > max_frags) 3131 goto out; 3132 3133 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3134 &subframe_len)) 3135 goto out; 3136 3137 ret = true; 3138 data = skb_push(skb, ETH_ALEN + 2); 3139 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3140 3141 data += 2 * ETH_ALEN; 3142 len = cpu_to_be16(subframe_len); 3143 memcpy(data, &len, 2); 3144 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3145 3146 head->len += skb->len; 3147 head->data_len += skb->len; 3148 *frag_tail = skb; 3149 3150 flow->backlog += head->len - orig_len; 3151 tin->backlog_bytes += head->len - orig_len; 3152 3153 fq_recalc_backlog(fq, tin, flow); 3154 3155 out: 3156 spin_unlock_bh(&fq->lock); 3157 3158 return ret; 3159 } 3160 3161 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3162 struct net_device *dev, struct sta_info *sta, 3163 struct ieee80211_fast_tx *fast_tx, 3164 struct sk_buff *skb) 3165 { 3166 struct ieee80211_local *local = sdata->local; 3167 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3168 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3169 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3170 struct ethhdr eth; 3171 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3172 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3173 struct ieee80211_tx_data tx; 3174 ieee80211_tx_result r; 3175 struct tid_ampdu_tx *tid_tx = NULL; 3176 u8 tid = IEEE80211_NUM_TIDS; 3177 3178 /* control port protocol needs a lot of special handling */ 3179 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3180 return false; 3181 3182 /* only RFC 1042 SNAP */ 3183 if (ethertype < ETH_P_802_3_MIN) 3184 return false; 3185 3186 /* don't handle TX status request here either */ 3187 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3188 return false; 3189 3190 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3191 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3192 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3193 if (tid_tx) { 3194 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3195 return false; 3196 if (tid_tx->timeout) 3197 tid_tx->last_tx = jiffies; 3198 } 3199 } 3200 3201 /* after this point (skb is modified) we cannot return false */ 3202 3203 if (skb_shared(skb)) { 3204 struct sk_buff *tmp_skb = skb; 3205 3206 skb = skb_clone(skb, GFP_ATOMIC); 3207 kfree_skb(tmp_skb); 3208 3209 if (!skb) 3210 return true; 3211 } 3212 3213 ieee80211_tx_stats(dev, skb->len + extra_head); 3214 3215 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3216 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3217 return true; 3218 3219 /* will not be crypto-handled beyond what we do here, so use false 3220 * as the may-encrypt argument for the resize to not account for 3221 * more room than we already have in 'extra_head' 3222 */ 3223 if (unlikely(ieee80211_skb_resize(sdata, skb, 3224 max_t(int, extra_head + hw_headroom - 3225 skb_headroom(skb), 0), 3226 false))) { 3227 kfree_skb(skb); 3228 return true; 3229 } 3230 3231 memcpy(ð, skb->data, ETH_HLEN - 2); 3232 hdr = (void *)skb_push(skb, extra_head); 3233 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3234 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3235 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3236 3237 memset(info, 0, sizeof(*info)); 3238 info->band = fast_tx->band; 3239 info->control.vif = &sdata->vif; 3240 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3241 IEEE80211_TX_CTL_DONTFRAG | 3242 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3243 3244 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3245 *ieee80211_get_qos_ctl(hdr) = tid; 3246 if (!sta->sta.txq[0]) 3247 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3248 } else { 3249 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3250 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3251 sdata->sequence_number += 0x10; 3252 } 3253 3254 if (skb_shinfo(skb)->gso_size) 3255 sta->tx_stats.msdu[tid] += 3256 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3257 else 3258 sta->tx_stats.msdu[tid]++; 3259 3260 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3261 3262 __skb_queue_head_init(&tx.skbs); 3263 3264 tx.flags = IEEE80211_TX_UNICAST; 3265 tx.local = local; 3266 tx.sdata = sdata; 3267 tx.sta = sta; 3268 tx.key = fast_tx->key; 3269 3270 if (fast_tx->key) 3271 info->control.hw_key = &fast_tx->key->conf; 3272 3273 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3274 tx.skb = skb; 3275 r = ieee80211_tx_h_rate_ctrl(&tx); 3276 skb = tx.skb; 3277 tx.skb = NULL; 3278 3279 if (r != TX_CONTINUE) { 3280 if (r != TX_QUEUED) 3281 kfree_skb(skb); 3282 return true; 3283 } 3284 } 3285 3286 /* statistics normally done by ieee80211_tx_h_stats (but that 3287 * has to consider fragmentation, so is more complex) 3288 */ 3289 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3290 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3291 3292 if (fast_tx->pn_offs) { 3293 u64 pn; 3294 u8 *crypto_hdr = skb->data + fast_tx->pn_offs; 3295 3296 switch (fast_tx->key->conf.cipher) { 3297 case WLAN_CIPHER_SUITE_CCMP: 3298 case WLAN_CIPHER_SUITE_CCMP_256: 3299 case WLAN_CIPHER_SUITE_GCMP: 3300 case WLAN_CIPHER_SUITE_GCMP_256: 3301 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn); 3302 crypto_hdr[0] = pn; 3303 crypto_hdr[1] = pn >> 8; 3304 crypto_hdr[4] = pn >> 16; 3305 crypto_hdr[5] = pn >> 24; 3306 crypto_hdr[6] = pn >> 32; 3307 crypto_hdr[7] = pn >> 40; 3308 break; 3309 } 3310 } 3311 3312 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3313 sdata = container_of(sdata->bss, 3314 struct ieee80211_sub_if_data, u.ap); 3315 3316 __skb_queue_tail(&tx.skbs, skb); 3317 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3318 return true; 3319 } 3320 3321 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3322 struct net_device *dev, 3323 u32 info_flags) 3324 { 3325 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3326 struct sta_info *sta; 3327 struct sk_buff *next; 3328 3329 if (unlikely(skb->len < ETH_HLEN)) { 3330 kfree_skb(skb); 3331 return; 3332 } 3333 3334 rcu_read_lock(); 3335 3336 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3337 goto out_free; 3338 3339 if (!IS_ERR_OR_NULL(sta)) { 3340 struct ieee80211_fast_tx *fast_tx; 3341 3342 fast_tx = rcu_dereference(sta->fast_tx); 3343 3344 if (fast_tx && 3345 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb)) 3346 goto out; 3347 } 3348 3349 if (skb_is_gso(skb)) { 3350 struct sk_buff *segs; 3351 3352 segs = skb_gso_segment(skb, 0); 3353 if (IS_ERR(segs)) { 3354 goto out_free; 3355 } else if (segs) { 3356 consume_skb(skb); 3357 skb = segs; 3358 } 3359 } else { 3360 /* we cannot process non-linear frames on this path */ 3361 if (skb_linearize(skb)) { 3362 kfree_skb(skb); 3363 goto out; 3364 } 3365 3366 /* the frame could be fragmented, software-encrypted, and other 3367 * things so we cannot really handle checksum offload with it - 3368 * fix it up in software before we handle anything else. 3369 */ 3370 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3371 skb_set_transport_header(skb, 3372 skb_checksum_start_offset(skb)); 3373 if (skb_checksum_help(skb)) 3374 goto out_free; 3375 } 3376 } 3377 3378 next = skb; 3379 while (next) { 3380 skb = next; 3381 next = skb->next; 3382 3383 skb->prev = NULL; 3384 skb->next = NULL; 3385 3386 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3387 if (IS_ERR(skb)) 3388 goto out; 3389 3390 ieee80211_tx_stats(dev, skb->len); 3391 3392 ieee80211_xmit(sdata, sta, skb); 3393 } 3394 goto out; 3395 out_free: 3396 kfree_skb(skb); 3397 out: 3398 rcu_read_unlock(); 3399 } 3400 3401 /** 3402 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3403 * @skb: packet to be sent 3404 * @dev: incoming interface 3405 * 3406 * On failure skb will be freed. 3407 */ 3408 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3409 struct net_device *dev) 3410 { 3411 __ieee80211_subif_start_xmit(skb, dev, 0); 3412 return NETDEV_TX_OK; 3413 } 3414 3415 struct sk_buff * 3416 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3417 struct sk_buff *skb, u32 info_flags) 3418 { 3419 struct ieee80211_hdr *hdr; 3420 struct ieee80211_tx_data tx = { 3421 .local = sdata->local, 3422 .sdata = sdata, 3423 }; 3424 struct sta_info *sta; 3425 3426 rcu_read_lock(); 3427 3428 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3429 kfree_skb(skb); 3430 skb = ERR_PTR(-EINVAL); 3431 goto out; 3432 } 3433 3434 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3435 if (IS_ERR(skb)) 3436 goto out; 3437 3438 hdr = (void *)skb->data; 3439 tx.sta = sta_info_get(sdata, hdr->addr1); 3440 tx.skb = skb; 3441 3442 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3443 rcu_read_unlock(); 3444 kfree_skb(skb); 3445 return ERR_PTR(-EINVAL); 3446 } 3447 3448 out: 3449 rcu_read_unlock(); 3450 return skb; 3451 } 3452 3453 /* 3454 * ieee80211_clear_tx_pending may not be called in a context where 3455 * it is possible that it packets could come in again. 3456 */ 3457 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3458 { 3459 struct sk_buff *skb; 3460 int i; 3461 3462 for (i = 0; i < local->hw.queues; i++) { 3463 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3464 ieee80211_free_txskb(&local->hw, skb); 3465 } 3466 } 3467 3468 /* 3469 * Returns false if the frame couldn't be transmitted but was queued instead, 3470 * which in this case means re-queued -- take as an indication to stop sending 3471 * more pending frames. 3472 */ 3473 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3474 struct sk_buff *skb) 3475 { 3476 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3477 struct ieee80211_sub_if_data *sdata; 3478 struct sta_info *sta; 3479 struct ieee80211_hdr *hdr; 3480 bool result; 3481 struct ieee80211_chanctx_conf *chanctx_conf; 3482 3483 sdata = vif_to_sdata(info->control.vif); 3484 3485 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3486 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3487 if (unlikely(!chanctx_conf)) { 3488 dev_kfree_skb(skb); 3489 return true; 3490 } 3491 info->band = chanctx_conf->def.chan->band; 3492 result = ieee80211_tx(sdata, NULL, skb, true); 3493 } else { 3494 struct sk_buff_head skbs; 3495 3496 __skb_queue_head_init(&skbs); 3497 __skb_queue_tail(&skbs, skb); 3498 3499 hdr = (struct ieee80211_hdr *)skb->data; 3500 sta = sta_info_get(sdata, hdr->addr1); 3501 3502 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3503 } 3504 3505 return result; 3506 } 3507 3508 /* 3509 * Transmit all pending packets. Called from tasklet. 3510 */ 3511 void ieee80211_tx_pending(unsigned long data) 3512 { 3513 struct ieee80211_local *local = (struct ieee80211_local *)data; 3514 unsigned long flags; 3515 int i; 3516 bool txok; 3517 3518 rcu_read_lock(); 3519 3520 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3521 for (i = 0; i < local->hw.queues; i++) { 3522 /* 3523 * If queue is stopped by something other than due to pending 3524 * frames, or we have no pending frames, proceed to next queue. 3525 */ 3526 if (local->queue_stop_reasons[i] || 3527 skb_queue_empty(&local->pending[i])) 3528 continue; 3529 3530 while (!skb_queue_empty(&local->pending[i])) { 3531 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3532 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3533 3534 if (WARN_ON(!info->control.vif)) { 3535 ieee80211_free_txskb(&local->hw, skb); 3536 continue; 3537 } 3538 3539 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3540 flags); 3541 3542 txok = ieee80211_tx_pending_skb(local, skb); 3543 spin_lock_irqsave(&local->queue_stop_reason_lock, 3544 flags); 3545 if (!txok) 3546 break; 3547 } 3548 3549 if (skb_queue_empty(&local->pending[i])) 3550 ieee80211_propagate_queue_wake(local, i); 3551 } 3552 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3553 3554 rcu_read_unlock(); 3555 } 3556 3557 /* functions for drivers to get certain frames */ 3558 3559 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3560 struct ps_data *ps, struct sk_buff *skb, 3561 bool is_template) 3562 { 3563 u8 *pos, *tim; 3564 int aid0 = 0; 3565 int i, have_bits = 0, n1, n2; 3566 3567 /* Generate bitmap for TIM only if there are any STAs in power save 3568 * mode. */ 3569 if (atomic_read(&ps->num_sta_ps) > 0) 3570 /* in the hope that this is faster than 3571 * checking byte-for-byte */ 3572 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3573 IEEE80211_MAX_AID+1); 3574 if (!is_template) { 3575 if (ps->dtim_count == 0) 3576 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3577 else 3578 ps->dtim_count--; 3579 } 3580 3581 tim = pos = (u8 *) skb_put(skb, 6); 3582 *pos++ = WLAN_EID_TIM; 3583 *pos++ = 4; 3584 *pos++ = ps->dtim_count; 3585 *pos++ = sdata->vif.bss_conf.dtim_period; 3586 3587 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3588 aid0 = 1; 3589 3590 ps->dtim_bc_mc = aid0 == 1; 3591 3592 if (have_bits) { 3593 /* Find largest even number N1 so that bits numbered 1 through 3594 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3595 * (N2 + 1) x 8 through 2007 are 0. */ 3596 n1 = 0; 3597 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3598 if (ps->tim[i]) { 3599 n1 = i & 0xfe; 3600 break; 3601 } 3602 } 3603 n2 = n1; 3604 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3605 if (ps->tim[i]) { 3606 n2 = i; 3607 break; 3608 } 3609 } 3610 3611 /* Bitmap control */ 3612 *pos++ = n1 | aid0; 3613 /* Part Virt Bitmap */ 3614 skb_put(skb, n2 - n1); 3615 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3616 3617 tim[1] = n2 - n1 + 4; 3618 } else { 3619 *pos++ = aid0; /* Bitmap control */ 3620 *pos++ = 0; /* Part Virt Bitmap */ 3621 } 3622 } 3623 3624 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3625 struct ps_data *ps, struct sk_buff *skb, 3626 bool is_template) 3627 { 3628 struct ieee80211_local *local = sdata->local; 3629 3630 /* 3631 * Not very nice, but we want to allow the driver to call 3632 * ieee80211_beacon_get() as a response to the set_tim() 3633 * callback. That, however, is already invoked under the 3634 * sta_lock to guarantee consistent and race-free update 3635 * of the tim bitmap in mac80211 and the driver. 3636 */ 3637 if (local->tim_in_locked_section) { 3638 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3639 } else { 3640 spin_lock_bh(&local->tim_lock); 3641 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3642 spin_unlock_bh(&local->tim_lock); 3643 } 3644 3645 return 0; 3646 } 3647 3648 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3649 struct beacon_data *beacon) 3650 { 3651 struct probe_resp *resp; 3652 u8 *beacon_data; 3653 size_t beacon_data_len; 3654 int i; 3655 u8 count = beacon->csa_current_counter; 3656 3657 switch (sdata->vif.type) { 3658 case NL80211_IFTYPE_AP: 3659 beacon_data = beacon->tail; 3660 beacon_data_len = beacon->tail_len; 3661 break; 3662 case NL80211_IFTYPE_ADHOC: 3663 beacon_data = beacon->head; 3664 beacon_data_len = beacon->head_len; 3665 break; 3666 case NL80211_IFTYPE_MESH_POINT: 3667 beacon_data = beacon->head; 3668 beacon_data_len = beacon->head_len; 3669 break; 3670 default: 3671 return; 3672 } 3673 3674 rcu_read_lock(); 3675 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 3676 resp = rcu_dereference(sdata->u.ap.probe_resp); 3677 3678 if (beacon->csa_counter_offsets[i]) { 3679 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 3680 beacon_data_len)) { 3681 rcu_read_unlock(); 3682 return; 3683 } 3684 3685 beacon_data[beacon->csa_counter_offsets[i]] = count; 3686 } 3687 3688 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 3689 resp->data[resp->csa_counter_offsets[i]] = count; 3690 } 3691 rcu_read_unlock(); 3692 } 3693 3694 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 3695 { 3696 beacon->csa_current_counter--; 3697 3698 /* the counter should never reach 0 */ 3699 WARN_ON_ONCE(!beacon->csa_current_counter); 3700 3701 return beacon->csa_current_counter; 3702 } 3703 3704 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 3705 { 3706 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3707 struct beacon_data *beacon = NULL; 3708 u8 count = 0; 3709 3710 rcu_read_lock(); 3711 3712 if (sdata->vif.type == NL80211_IFTYPE_AP) 3713 beacon = rcu_dereference(sdata->u.ap.beacon); 3714 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 3715 beacon = rcu_dereference(sdata->u.ibss.presp); 3716 else if (ieee80211_vif_is_mesh(&sdata->vif)) 3717 beacon = rcu_dereference(sdata->u.mesh.beacon); 3718 3719 if (!beacon) 3720 goto unlock; 3721 3722 count = __ieee80211_csa_update_counter(beacon); 3723 3724 unlock: 3725 rcu_read_unlock(); 3726 return count; 3727 } 3728 EXPORT_SYMBOL(ieee80211_csa_update_counter); 3729 3730 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 3731 { 3732 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 3733 struct beacon_data *beacon = NULL; 3734 u8 *beacon_data; 3735 size_t beacon_data_len; 3736 int ret = false; 3737 3738 if (!ieee80211_sdata_running(sdata)) 3739 return false; 3740 3741 rcu_read_lock(); 3742 if (vif->type == NL80211_IFTYPE_AP) { 3743 struct ieee80211_if_ap *ap = &sdata->u.ap; 3744 3745 beacon = rcu_dereference(ap->beacon); 3746 if (WARN_ON(!beacon || !beacon->tail)) 3747 goto out; 3748 beacon_data = beacon->tail; 3749 beacon_data_len = beacon->tail_len; 3750 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 3751 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3752 3753 beacon = rcu_dereference(ifibss->presp); 3754 if (!beacon) 3755 goto out; 3756 3757 beacon_data = beacon->head; 3758 beacon_data_len = beacon->head_len; 3759 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 3760 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3761 3762 beacon = rcu_dereference(ifmsh->beacon); 3763 if (!beacon) 3764 goto out; 3765 3766 beacon_data = beacon->head; 3767 beacon_data_len = beacon->head_len; 3768 } else { 3769 WARN_ON(1); 3770 goto out; 3771 } 3772 3773 if (!beacon->csa_counter_offsets[0]) 3774 goto out; 3775 3776 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 3777 goto out; 3778 3779 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 3780 ret = true; 3781 out: 3782 rcu_read_unlock(); 3783 3784 return ret; 3785 } 3786 EXPORT_SYMBOL(ieee80211_csa_is_complete); 3787 3788 static struct sk_buff * 3789 __ieee80211_beacon_get(struct ieee80211_hw *hw, 3790 struct ieee80211_vif *vif, 3791 struct ieee80211_mutable_offsets *offs, 3792 bool is_template) 3793 { 3794 struct ieee80211_local *local = hw_to_local(hw); 3795 struct beacon_data *beacon = NULL; 3796 struct sk_buff *skb = NULL; 3797 struct ieee80211_tx_info *info; 3798 struct ieee80211_sub_if_data *sdata = NULL; 3799 enum nl80211_band band; 3800 struct ieee80211_tx_rate_control txrc; 3801 struct ieee80211_chanctx_conf *chanctx_conf; 3802 int csa_off_base = 0; 3803 3804 rcu_read_lock(); 3805 3806 sdata = vif_to_sdata(vif); 3807 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3808 3809 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 3810 goto out; 3811 3812 if (offs) 3813 memset(offs, 0, sizeof(*offs)); 3814 3815 if (sdata->vif.type == NL80211_IFTYPE_AP) { 3816 struct ieee80211_if_ap *ap = &sdata->u.ap; 3817 3818 beacon = rcu_dereference(ap->beacon); 3819 if (beacon) { 3820 if (beacon->csa_counter_offsets[0]) { 3821 if (!is_template) 3822 __ieee80211_csa_update_counter(beacon); 3823 3824 ieee80211_set_csa(sdata, beacon); 3825 } 3826 3827 /* 3828 * headroom, head length, 3829 * tail length and maximum TIM length 3830 */ 3831 skb = dev_alloc_skb(local->tx_headroom + 3832 beacon->head_len + 3833 beacon->tail_len + 256 + 3834 local->hw.extra_beacon_tailroom); 3835 if (!skb) 3836 goto out; 3837 3838 skb_reserve(skb, local->tx_headroom); 3839 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3840 beacon->head_len); 3841 3842 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 3843 is_template); 3844 3845 if (offs) { 3846 offs->tim_offset = beacon->head_len; 3847 offs->tim_length = skb->len - beacon->head_len; 3848 3849 /* for AP the csa offsets are from tail */ 3850 csa_off_base = skb->len; 3851 } 3852 3853 if (beacon->tail) 3854 memcpy(skb_put(skb, beacon->tail_len), 3855 beacon->tail, beacon->tail_len); 3856 } else 3857 goto out; 3858 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 3859 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 3860 struct ieee80211_hdr *hdr; 3861 3862 beacon = rcu_dereference(ifibss->presp); 3863 if (!beacon) 3864 goto out; 3865 3866 if (beacon->csa_counter_offsets[0]) { 3867 if (!is_template) 3868 __ieee80211_csa_update_counter(beacon); 3869 3870 ieee80211_set_csa(sdata, beacon); 3871 } 3872 3873 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 3874 local->hw.extra_beacon_tailroom); 3875 if (!skb) 3876 goto out; 3877 skb_reserve(skb, local->tx_headroom); 3878 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3879 beacon->head_len); 3880 3881 hdr = (struct ieee80211_hdr *) skb->data; 3882 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 3883 IEEE80211_STYPE_BEACON); 3884 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3885 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 3886 3887 beacon = rcu_dereference(ifmsh->beacon); 3888 if (!beacon) 3889 goto out; 3890 3891 if (beacon->csa_counter_offsets[0]) { 3892 if (!is_template) 3893 /* TODO: For mesh csa_counter is in TU, so 3894 * decrementing it by one isn't correct, but 3895 * for now we leave it consistent with overall 3896 * mac80211's behavior. 3897 */ 3898 __ieee80211_csa_update_counter(beacon); 3899 3900 ieee80211_set_csa(sdata, beacon); 3901 } 3902 3903 if (ifmsh->sync_ops) 3904 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 3905 3906 skb = dev_alloc_skb(local->tx_headroom + 3907 beacon->head_len + 3908 256 + /* TIM IE */ 3909 beacon->tail_len + 3910 local->hw.extra_beacon_tailroom); 3911 if (!skb) 3912 goto out; 3913 skb_reserve(skb, local->tx_headroom); 3914 memcpy(skb_put(skb, beacon->head_len), beacon->head, 3915 beacon->head_len); 3916 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 3917 3918 if (offs) { 3919 offs->tim_offset = beacon->head_len; 3920 offs->tim_length = skb->len - beacon->head_len; 3921 } 3922 3923 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 3924 beacon->tail_len); 3925 } else { 3926 WARN_ON(1); 3927 goto out; 3928 } 3929 3930 /* CSA offsets */ 3931 if (offs && beacon) { 3932 int i; 3933 3934 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 3935 u16 csa_off = beacon->csa_counter_offsets[i]; 3936 3937 if (!csa_off) 3938 continue; 3939 3940 offs->csa_counter_offs[i] = csa_off_base + csa_off; 3941 } 3942 } 3943 3944 band = chanctx_conf->def.chan->band; 3945 3946 info = IEEE80211_SKB_CB(skb); 3947 3948 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 3949 info->flags |= IEEE80211_TX_CTL_NO_ACK; 3950 info->band = band; 3951 3952 memset(&txrc, 0, sizeof(txrc)); 3953 txrc.hw = hw; 3954 txrc.sband = local->hw.wiphy->bands[band]; 3955 txrc.bss_conf = &sdata->vif.bss_conf; 3956 txrc.skb = skb; 3957 txrc.reported_rate.idx = -1; 3958 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 3959 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 3960 txrc.max_rate_idx = -1; 3961 else 3962 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 3963 txrc.bss = true; 3964 rate_control_get_rate(sdata, NULL, &txrc); 3965 3966 info->control.vif = vif; 3967 3968 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 3969 IEEE80211_TX_CTL_ASSIGN_SEQ | 3970 IEEE80211_TX_CTL_FIRST_FRAGMENT; 3971 out: 3972 rcu_read_unlock(); 3973 return skb; 3974 3975 } 3976 3977 struct sk_buff * 3978 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 3979 struct ieee80211_vif *vif, 3980 struct ieee80211_mutable_offsets *offs) 3981 { 3982 return __ieee80211_beacon_get(hw, vif, offs, true); 3983 } 3984 EXPORT_SYMBOL(ieee80211_beacon_get_template); 3985 3986 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 3987 struct ieee80211_vif *vif, 3988 u16 *tim_offset, u16 *tim_length) 3989 { 3990 struct ieee80211_mutable_offsets offs = {}; 3991 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 3992 struct sk_buff *copy; 3993 struct ieee80211_supported_band *sband; 3994 int shift; 3995 3996 if (!bcn) 3997 return bcn; 3998 3999 if (tim_offset) 4000 *tim_offset = offs.tim_offset; 4001 4002 if (tim_length) 4003 *tim_length = offs.tim_length; 4004 4005 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4006 !hw_to_local(hw)->monitors) 4007 return bcn; 4008 4009 /* send a copy to monitor interfaces */ 4010 copy = skb_copy(bcn, GFP_ATOMIC); 4011 if (!copy) 4012 return bcn; 4013 4014 shift = ieee80211_vif_get_shift(vif); 4015 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))]; 4016 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4017 4018 return bcn; 4019 } 4020 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4021 4022 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4023 struct ieee80211_vif *vif) 4024 { 4025 struct ieee80211_if_ap *ap = NULL; 4026 struct sk_buff *skb = NULL; 4027 struct probe_resp *presp = NULL; 4028 struct ieee80211_hdr *hdr; 4029 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4030 4031 if (sdata->vif.type != NL80211_IFTYPE_AP) 4032 return NULL; 4033 4034 rcu_read_lock(); 4035 4036 ap = &sdata->u.ap; 4037 presp = rcu_dereference(ap->probe_resp); 4038 if (!presp) 4039 goto out; 4040 4041 skb = dev_alloc_skb(presp->len); 4042 if (!skb) 4043 goto out; 4044 4045 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 4046 4047 hdr = (struct ieee80211_hdr *) skb->data; 4048 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4049 4050 out: 4051 rcu_read_unlock(); 4052 return skb; 4053 } 4054 EXPORT_SYMBOL(ieee80211_proberesp_get); 4055 4056 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4057 struct ieee80211_vif *vif) 4058 { 4059 struct ieee80211_sub_if_data *sdata; 4060 struct ieee80211_if_managed *ifmgd; 4061 struct ieee80211_pspoll *pspoll; 4062 struct ieee80211_local *local; 4063 struct sk_buff *skb; 4064 4065 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4066 return NULL; 4067 4068 sdata = vif_to_sdata(vif); 4069 ifmgd = &sdata->u.mgd; 4070 local = sdata->local; 4071 4072 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4073 if (!skb) 4074 return NULL; 4075 4076 skb_reserve(skb, local->hw.extra_tx_headroom); 4077 4078 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 4079 memset(pspoll, 0, sizeof(*pspoll)); 4080 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4081 IEEE80211_STYPE_PSPOLL); 4082 pspoll->aid = cpu_to_le16(ifmgd->aid); 4083 4084 /* aid in PS-Poll has its two MSBs each set to 1 */ 4085 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4086 4087 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4088 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4089 4090 return skb; 4091 } 4092 EXPORT_SYMBOL(ieee80211_pspoll_get); 4093 4094 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4095 struct ieee80211_vif *vif) 4096 { 4097 struct ieee80211_hdr_3addr *nullfunc; 4098 struct ieee80211_sub_if_data *sdata; 4099 struct ieee80211_if_managed *ifmgd; 4100 struct ieee80211_local *local; 4101 struct sk_buff *skb; 4102 4103 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4104 return NULL; 4105 4106 sdata = vif_to_sdata(vif); 4107 ifmgd = &sdata->u.mgd; 4108 local = sdata->local; 4109 4110 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 4111 if (!skb) 4112 return NULL; 4113 4114 skb_reserve(skb, local->hw.extra_tx_headroom); 4115 4116 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 4117 sizeof(*nullfunc)); 4118 memset(nullfunc, 0, sizeof(*nullfunc)); 4119 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4120 IEEE80211_STYPE_NULLFUNC | 4121 IEEE80211_FCTL_TODS); 4122 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4123 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4124 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4125 4126 return skb; 4127 } 4128 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4129 4130 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4131 const u8 *src_addr, 4132 const u8 *ssid, size_t ssid_len, 4133 size_t tailroom) 4134 { 4135 struct ieee80211_local *local = hw_to_local(hw); 4136 struct ieee80211_hdr_3addr *hdr; 4137 struct sk_buff *skb; 4138 size_t ie_ssid_len; 4139 u8 *pos; 4140 4141 ie_ssid_len = 2 + ssid_len; 4142 4143 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4144 ie_ssid_len + tailroom); 4145 if (!skb) 4146 return NULL; 4147 4148 skb_reserve(skb, local->hw.extra_tx_headroom); 4149 4150 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 4151 memset(hdr, 0, sizeof(*hdr)); 4152 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4153 IEEE80211_STYPE_PROBE_REQ); 4154 eth_broadcast_addr(hdr->addr1); 4155 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4156 eth_broadcast_addr(hdr->addr3); 4157 4158 pos = skb_put(skb, ie_ssid_len); 4159 *pos++ = WLAN_EID_SSID; 4160 *pos++ = ssid_len; 4161 if (ssid_len) 4162 memcpy(pos, ssid, ssid_len); 4163 pos += ssid_len; 4164 4165 return skb; 4166 } 4167 EXPORT_SYMBOL(ieee80211_probereq_get); 4168 4169 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4170 const void *frame, size_t frame_len, 4171 const struct ieee80211_tx_info *frame_txctl, 4172 struct ieee80211_rts *rts) 4173 { 4174 const struct ieee80211_hdr *hdr = frame; 4175 4176 rts->frame_control = 4177 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4178 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4179 frame_txctl); 4180 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4181 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4182 } 4183 EXPORT_SYMBOL(ieee80211_rts_get); 4184 4185 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4186 const void *frame, size_t frame_len, 4187 const struct ieee80211_tx_info *frame_txctl, 4188 struct ieee80211_cts *cts) 4189 { 4190 const struct ieee80211_hdr *hdr = frame; 4191 4192 cts->frame_control = 4193 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4194 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4195 frame_len, frame_txctl); 4196 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4197 } 4198 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4199 4200 struct sk_buff * 4201 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4202 struct ieee80211_vif *vif) 4203 { 4204 struct ieee80211_local *local = hw_to_local(hw); 4205 struct sk_buff *skb = NULL; 4206 struct ieee80211_tx_data tx; 4207 struct ieee80211_sub_if_data *sdata; 4208 struct ps_data *ps; 4209 struct ieee80211_tx_info *info; 4210 struct ieee80211_chanctx_conf *chanctx_conf; 4211 4212 sdata = vif_to_sdata(vif); 4213 4214 rcu_read_lock(); 4215 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4216 4217 if (!chanctx_conf) 4218 goto out; 4219 4220 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4221 struct beacon_data *beacon = 4222 rcu_dereference(sdata->u.ap.beacon); 4223 4224 if (!beacon || !beacon->head) 4225 goto out; 4226 4227 ps = &sdata->u.ap.ps; 4228 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4229 ps = &sdata->u.mesh.ps; 4230 } else { 4231 goto out; 4232 } 4233 4234 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4235 goto out; /* send buffered bc/mc only after DTIM beacon */ 4236 4237 while (1) { 4238 skb = skb_dequeue(&ps->bc_buf); 4239 if (!skb) 4240 goto out; 4241 local->total_ps_buffered--; 4242 4243 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4244 struct ieee80211_hdr *hdr = 4245 (struct ieee80211_hdr *) skb->data; 4246 /* more buffered multicast/broadcast frames ==> set 4247 * MoreData flag in IEEE 802.11 header to inform PS 4248 * STAs */ 4249 hdr->frame_control |= 4250 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4251 } 4252 4253 if (sdata->vif.type == NL80211_IFTYPE_AP) 4254 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4255 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4256 break; 4257 ieee80211_free_txskb(hw, skb); 4258 } 4259 4260 info = IEEE80211_SKB_CB(skb); 4261 4262 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4263 info->band = chanctx_conf->def.chan->band; 4264 4265 if (invoke_tx_handlers(&tx)) 4266 skb = NULL; 4267 out: 4268 rcu_read_unlock(); 4269 4270 return skb; 4271 } 4272 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4273 4274 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4275 { 4276 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4277 struct ieee80211_sub_if_data *sdata = sta->sdata; 4278 struct ieee80211_local *local = sdata->local; 4279 int ret; 4280 u32 queues; 4281 4282 lockdep_assert_held(&local->sta_mtx); 4283 4284 /* only some cases are supported right now */ 4285 switch (sdata->vif.type) { 4286 case NL80211_IFTYPE_STATION: 4287 case NL80211_IFTYPE_AP: 4288 case NL80211_IFTYPE_AP_VLAN: 4289 break; 4290 default: 4291 WARN_ON(1); 4292 return -EINVAL; 4293 } 4294 4295 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4296 return -EINVAL; 4297 4298 if (sta->reserved_tid == tid) { 4299 ret = 0; 4300 goto out; 4301 } 4302 4303 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4304 sdata_err(sdata, "TID reservation already active\n"); 4305 ret = -EALREADY; 4306 goto out; 4307 } 4308 4309 ieee80211_stop_vif_queues(sdata->local, sdata, 4310 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4311 4312 synchronize_net(); 4313 4314 /* Tear down BA sessions so we stop aggregating on this TID */ 4315 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4316 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4317 __ieee80211_stop_tx_ba_session(sta, tid, 4318 AGG_STOP_LOCAL_REQUEST); 4319 } 4320 4321 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4322 __ieee80211_flush_queues(local, sdata, queues, false); 4323 4324 sta->reserved_tid = tid; 4325 4326 ieee80211_wake_vif_queues(local, sdata, 4327 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4328 4329 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4330 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4331 4332 ret = 0; 4333 out: 4334 return ret; 4335 } 4336 EXPORT_SYMBOL(ieee80211_reserve_tid); 4337 4338 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4339 { 4340 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4341 struct ieee80211_sub_if_data *sdata = sta->sdata; 4342 4343 lockdep_assert_held(&sdata->local->sta_mtx); 4344 4345 /* only some cases are supported right now */ 4346 switch (sdata->vif.type) { 4347 case NL80211_IFTYPE_STATION: 4348 case NL80211_IFTYPE_AP: 4349 case NL80211_IFTYPE_AP_VLAN: 4350 break; 4351 default: 4352 WARN_ON(1); 4353 return; 4354 } 4355 4356 if (tid != sta->reserved_tid) { 4357 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4358 return; 4359 } 4360 4361 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4362 } 4363 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4364 4365 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4366 struct sk_buff *skb, int tid, 4367 enum nl80211_band band) 4368 { 4369 int ac = ieee802_1d_to_ac[tid & 7]; 4370 4371 skb_reset_mac_header(skb); 4372 skb_set_queue_mapping(skb, ac); 4373 skb->priority = tid; 4374 4375 skb->dev = sdata->dev; 4376 4377 /* 4378 * The other path calling ieee80211_xmit is from the tasklet, 4379 * and while we can handle concurrent transmissions locking 4380 * requirements are that we do not come into tx with bhs on. 4381 */ 4382 local_bh_disable(); 4383 IEEE80211_SKB_CB(skb)->band = band; 4384 ieee80211_xmit(sdata, NULL, skb); 4385 local_bh_enable(); 4386 } 4387