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/if_vlan.h> 20 #include <linux/etherdevice.h> 21 #include <linux/bitmap.h> 22 #include <linux/rcupdate.h> 23 #include <linux/export.h> 24 #include <net/net_namespace.h> 25 #include <net/ieee80211_radiotap.h> 26 #include <net/cfg80211.h> 27 #include <net/mac80211.h> 28 #include <net/codel.h> 29 #include <net/codel_impl.h> 30 #include <asm/unaligned.h> 31 #include <net/fq_impl.h> 32 33 #include "ieee80211_i.h" 34 #include "driver-ops.h" 35 #include "led.h" 36 #include "mesh.h" 37 #include "wep.h" 38 #include "wpa.h" 39 #include "wme.h" 40 #include "rate.h" 41 42 /* misc utils */ 43 44 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 45 { 46 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 47 48 u64_stats_update_begin(&tstats->syncp); 49 tstats->tx_packets++; 50 tstats->tx_bytes += len; 51 u64_stats_update_end(&tstats->syncp); 52 } 53 54 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 55 struct sk_buff *skb, int group_addr, 56 int next_frag_len) 57 { 58 int rate, mrate, erp, dur, i, shift = 0; 59 struct ieee80211_rate *txrate; 60 struct ieee80211_local *local = tx->local; 61 struct ieee80211_supported_band *sband; 62 struct ieee80211_hdr *hdr; 63 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 64 struct ieee80211_chanctx_conf *chanctx_conf; 65 u32 rate_flags = 0; 66 67 /* assume HW handles this */ 68 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 69 return 0; 70 71 rcu_read_lock(); 72 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 73 if (chanctx_conf) { 74 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 75 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 76 } 77 rcu_read_unlock(); 78 79 /* uh huh? */ 80 if (WARN_ON_ONCE(tx->rate.idx < 0)) 81 return 0; 82 83 sband = local->hw.wiphy->bands[info->band]; 84 txrate = &sband->bitrates[tx->rate.idx]; 85 86 erp = txrate->flags & IEEE80211_RATE_ERP_G; 87 88 /* 89 * data and mgmt (except PS Poll): 90 * - during CFP: 32768 91 * - during contention period: 92 * if addr1 is group address: 0 93 * if more fragments = 0 and addr1 is individual address: time to 94 * transmit one ACK plus SIFS 95 * if more fragments = 1 and addr1 is individual address: time to 96 * transmit next fragment plus 2 x ACK plus 3 x SIFS 97 * 98 * IEEE 802.11, 9.6: 99 * - control response frame (CTS or ACK) shall be transmitted using the 100 * same rate as the immediately previous frame in the frame exchange 101 * sequence, if this rate belongs to the PHY mandatory rates, or else 102 * at the highest possible rate belonging to the PHY rates in the 103 * BSSBasicRateSet 104 */ 105 hdr = (struct ieee80211_hdr *)skb->data; 106 if (ieee80211_is_ctl(hdr->frame_control)) { 107 /* TODO: These control frames are not currently sent by 108 * mac80211, but should they be implemented, this function 109 * needs to be updated to support duration field calculation. 110 * 111 * RTS: time needed to transmit pending data/mgmt frame plus 112 * one CTS frame plus one ACK frame plus 3 x SIFS 113 * CTS: duration of immediately previous RTS minus time 114 * required to transmit CTS and its SIFS 115 * ACK: 0 if immediately previous directed data/mgmt had 116 * more=0, with more=1 duration in ACK frame is duration 117 * from previous frame minus time needed to transmit ACK 118 * and its SIFS 119 * PS Poll: BIT(15) | BIT(14) | aid 120 */ 121 return 0; 122 } 123 124 /* data/mgmt */ 125 if (0 /* FIX: data/mgmt during CFP */) 126 return cpu_to_le16(32768); 127 128 if (group_addr) /* Group address as the destination - no ACK */ 129 return 0; 130 131 /* Individual destination address: 132 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 133 * CTS and ACK frames shall be transmitted using the highest rate in 134 * basic rate set that is less than or equal to the rate of the 135 * immediately previous frame and that is using the same modulation 136 * (CCK or OFDM). If no basic rate set matches with these requirements, 137 * the highest mandatory rate of the PHY that is less than or equal to 138 * the rate of the previous frame is used. 139 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 140 */ 141 rate = -1; 142 /* use lowest available if everything fails */ 143 mrate = sband->bitrates[0].bitrate; 144 for (i = 0; i < sband->n_bitrates; i++) { 145 struct ieee80211_rate *r = &sband->bitrates[i]; 146 147 if (r->bitrate > txrate->bitrate) 148 break; 149 150 if ((rate_flags & r->flags) != rate_flags) 151 continue; 152 153 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 154 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 155 156 switch (sband->band) { 157 case NL80211_BAND_2GHZ: { 158 u32 flag; 159 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 160 flag = IEEE80211_RATE_MANDATORY_G; 161 else 162 flag = IEEE80211_RATE_MANDATORY_B; 163 if (r->flags & flag) 164 mrate = r->bitrate; 165 break; 166 } 167 case NL80211_BAND_5GHZ: 168 if (r->flags & IEEE80211_RATE_MANDATORY_A) 169 mrate = r->bitrate; 170 break; 171 case NL80211_BAND_60GHZ: 172 /* TODO, for now fall through */ 173 case NUM_NL80211_BANDS: 174 WARN_ON(1); 175 break; 176 } 177 } 178 if (rate == -1) { 179 /* No matching basic rate found; use highest suitable mandatory 180 * PHY rate */ 181 rate = DIV_ROUND_UP(mrate, 1 << shift); 182 } 183 184 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 185 if (ieee80211_is_data_qos(hdr->frame_control) && 186 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 187 dur = 0; 188 else 189 /* Time needed to transmit ACK 190 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 191 * to closest integer */ 192 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 193 tx->sdata->vif.bss_conf.use_short_preamble, 194 shift); 195 196 if (next_frag_len) { 197 /* Frame is fragmented: duration increases with time needed to 198 * transmit next fragment plus ACK and 2 x SIFS. */ 199 dur *= 2; /* ACK + SIFS */ 200 /* next fragment */ 201 dur += ieee80211_frame_duration(sband->band, next_frag_len, 202 txrate->bitrate, erp, 203 tx->sdata->vif.bss_conf.use_short_preamble, 204 shift); 205 } 206 207 return cpu_to_le16(dur); 208 } 209 210 /* tx handlers */ 211 static ieee80211_tx_result debug_noinline 212 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 213 { 214 struct ieee80211_local *local = tx->local; 215 struct ieee80211_if_managed *ifmgd; 216 217 /* driver doesn't support power save */ 218 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 219 return TX_CONTINUE; 220 221 /* hardware does dynamic power save */ 222 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 223 return TX_CONTINUE; 224 225 /* dynamic power save disabled */ 226 if (local->hw.conf.dynamic_ps_timeout <= 0) 227 return TX_CONTINUE; 228 229 /* we are scanning, don't enable power save */ 230 if (local->scanning) 231 return TX_CONTINUE; 232 233 if (!local->ps_sdata) 234 return TX_CONTINUE; 235 236 /* No point if we're going to suspend */ 237 if (local->quiescing) 238 return TX_CONTINUE; 239 240 /* dynamic ps is supported only in managed mode */ 241 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 242 return TX_CONTINUE; 243 244 ifmgd = &tx->sdata->u.mgd; 245 246 /* 247 * Don't wakeup from power save if u-apsd is enabled, voip ac has 248 * u-apsd enabled and the frame is in voip class. This effectively 249 * means that even if all access categories have u-apsd enabled, in 250 * practise u-apsd is only used with the voip ac. This is a 251 * workaround for the case when received voip class packets do not 252 * have correct qos tag for some reason, due the network or the 253 * peer application. 254 * 255 * Note: ifmgd->uapsd_queues access is racy here. If the value is 256 * changed via debugfs, user needs to reassociate manually to have 257 * everything in sync. 258 */ 259 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 260 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 261 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 262 return TX_CONTINUE; 263 264 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 265 ieee80211_stop_queues_by_reason(&local->hw, 266 IEEE80211_MAX_QUEUE_MAP, 267 IEEE80211_QUEUE_STOP_REASON_PS, 268 false); 269 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 270 ieee80211_queue_work(&local->hw, 271 &local->dynamic_ps_disable_work); 272 } 273 274 /* Don't restart the timer if we're not disassociated */ 275 if (!ifmgd->associated) 276 return TX_CONTINUE; 277 278 mod_timer(&local->dynamic_ps_timer, jiffies + 279 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 280 281 return TX_CONTINUE; 282 } 283 284 static ieee80211_tx_result debug_noinline 285 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 286 { 287 288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 290 bool assoc = false; 291 292 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 293 return TX_CONTINUE; 294 295 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 296 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 297 !ieee80211_is_probe_req(hdr->frame_control) && 298 !ieee80211_is_nullfunc(hdr->frame_control)) 299 /* 300 * When software scanning only nullfunc frames (to notify 301 * the sleep state to the AP) and probe requests (for the 302 * active scan) are allowed, all other frames should not be 303 * sent and we should not get here, but if we do 304 * nonetheless, drop them to avoid sending them 305 * off-channel. See the link below and 306 * ieee80211_start_scan() for more. 307 * 308 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 309 */ 310 return TX_DROP; 311 312 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 313 return TX_CONTINUE; 314 315 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 316 return TX_CONTINUE; 317 318 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 319 return TX_CONTINUE; 320 321 if (tx->sta) 322 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 323 324 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 325 if (unlikely(!assoc && 326 ieee80211_is_data(hdr->frame_control))) { 327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 328 sdata_info(tx->sdata, 329 "dropped data frame to not associated station %pM\n", 330 hdr->addr1); 331 #endif 332 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 333 return TX_DROP; 334 } 335 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 336 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 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]; 685 686 if (tx->sdata->rc_has_mcs_mask[info->band]) 687 txrc.rate_idx_mcs_mask = 688 tx->sdata->rc_rateidx_mcs_mask[info->band]; 689 690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 693 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 694 695 /* set up RTS protection if desired */ 696 if (len > tx->local->hw.wiphy->rts_threshold) { 697 txrc.rts = true; 698 } 699 700 info->control.use_rts = txrc.rts; 701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 702 703 /* 704 * Use short preamble if the BSS can handle it, but not for 705 * management frames unless we know the receiver can handle 706 * that -- the management frame might be to a station that 707 * just wants a probe response. 708 */ 709 if (tx->sdata->vif.bss_conf.use_short_preamble && 710 (ieee80211_is_data(hdr->frame_control) || 711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 712 txrc.short_preamble = true; 713 714 info->control.short_preamble = txrc.short_preamble; 715 716 /* don't ask rate control when rate already injected via radiotap */ 717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 718 return TX_CONTINUE; 719 720 if (tx->sta) 721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 722 723 /* 724 * Lets not bother rate control if we're associated and cannot 725 * talk to the sta. This should not happen. 726 */ 727 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 728 !rate_usable_index_exists(sband, &tx->sta->sta), 729 "%s: Dropped data frame as no usable bitrate found while " 730 "scanning and associated. Target station: " 731 "%pM on %d GHz band\n", 732 tx->sdata->name, hdr->addr1, 733 info->band ? 5 : 2)) 734 return TX_DROP; 735 736 /* 737 * If we're associated with the sta at this point we know we can at 738 * least send the frame at the lowest bit rate. 739 */ 740 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 741 742 if (tx->sta && !info->control.skip_table) 743 ratetbl = rcu_dereference(tx->sta->sta.rates); 744 745 if (unlikely(info->control.rates[0].idx < 0)) { 746 if (ratetbl) { 747 struct ieee80211_tx_rate rate = { 748 .idx = ratetbl->rate[0].idx, 749 .flags = ratetbl->rate[0].flags, 750 .count = ratetbl->rate[0].count 751 }; 752 753 if (ratetbl->rate[0].idx < 0) 754 return TX_DROP; 755 756 tx->rate = rate; 757 } else { 758 return TX_DROP; 759 } 760 } else { 761 tx->rate = info->control.rates[0]; 762 } 763 764 if (txrc.reported_rate.idx < 0) { 765 txrc.reported_rate = tx->rate; 766 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 767 tx->sta->tx_stats.last_rate = txrc.reported_rate; 768 } else if (tx->sta) 769 tx->sta->tx_stats.last_rate = txrc.reported_rate; 770 771 if (ratetbl) 772 return TX_CONTINUE; 773 774 if (unlikely(!info->control.rates[0].count)) 775 info->control.rates[0].count = 1; 776 777 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 778 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 779 info->control.rates[0].count = 1; 780 781 return TX_CONTINUE; 782 } 783 784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 785 { 786 u16 *seq = &sta->tid_seq[tid]; 787 __le16 ret = cpu_to_le16(*seq); 788 789 /* Increase the sequence number. */ 790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 791 792 return ret; 793 } 794 795 static ieee80211_tx_result debug_noinline 796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 797 { 798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 800 int tid; 801 802 /* 803 * Packet injection may want to control the sequence 804 * number, if we have no matching interface then we 805 * neither assign one ourselves nor ask the driver to. 806 */ 807 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 808 return TX_CONTINUE; 809 810 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 811 return TX_CONTINUE; 812 813 if (ieee80211_hdrlen(hdr->frame_control) < 24) 814 return TX_CONTINUE; 815 816 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 817 return TX_CONTINUE; 818 819 /* 820 * Anything but QoS data that has a sequence number field 821 * (is long enough) gets a sequence number from the global 822 * counter. QoS data frames with a multicast destination 823 * also use the global counter (802.11-2012 9.3.2.10). 824 */ 825 if (!ieee80211_is_data_qos(hdr->frame_control) || 826 is_multicast_ether_addr(hdr->addr1)) { 827 /* driver should assign sequence number */ 828 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 829 /* for pure STA mode without beacons, we can do it */ 830 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 831 tx->sdata->sequence_number += 0x10; 832 if (tx->sta) 833 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 834 return TX_CONTINUE; 835 } 836 837 /* 838 * This should be true for injected/management frames only, for 839 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 840 * above since they are not QoS-data frames. 841 */ 842 if (!tx->sta) 843 return TX_CONTINUE; 844 845 /* include per-STA, per-TID sequence counter */ 846 tid = ieee80211_get_tid(hdr); 847 tx->sta->tx_stats.msdu[tid]++; 848 849 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 850 851 return TX_CONTINUE; 852 } 853 854 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 855 struct sk_buff *skb, int hdrlen, 856 int frag_threshold) 857 { 858 struct ieee80211_local *local = tx->local; 859 struct ieee80211_tx_info *info; 860 struct sk_buff *tmp; 861 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 862 int pos = hdrlen + per_fragm; 863 int rem = skb->len - hdrlen - per_fragm; 864 865 if (WARN_ON(rem < 0)) 866 return -EINVAL; 867 868 /* first fragment was already added to queue by caller */ 869 870 while (rem) { 871 int fraglen = per_fragm; 872 873 if (fraglen > rem) 874 fraglen = rem; 875 rem -= fraglen; 876 tmp = dev_alloc_skb(local->tx_headroom + 877 frag_threshold + 878 tx->sdata->encrypt_headroom + 879 IEEE80211_ENCRYPT_TAILROOM); 880 if (!tmp) 881 return -ENOMEM; 882 883 __skb_queue_tail(&tx->skbs, tmp); 884 885 skb_reserve(tmp, 886 local->tx_headroom + tx->sdata->encrypt_headroom); 887 888 /* copy control information */ 889 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 890 891 info = IEEE80211_SKB_CB(tmp); 892 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 893 IEEE80211_TX_CTL_FIRST_FRAGMENT); 894 895 if (rem) 896 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 897 898 skb_copy_queue_mapping(tmp, skb); 899 tmp->priority = skb->priority; 900 tmp->dev = skb->dev; 901 902 /* copy header and data */ 903 skb_put_data(tmp, skb->data, hdrlen); 904 skb_put_data(tmp, skb->data + pos, fraglen); 905 906 pos += fraglen; 907 } 908 909 /* adjust first fragment's length */ 910 skb_trim(skb, hdrlen + per_fragm); 911 return 0; 912 } 913 914 static ieee80211_tx_result debug_noinline 915 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 916 { 917 struct sk_buff *skb = tx->skb; 918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 919 struct ieee80211_hdr *hdr = (void *)skb->data; 920 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 921 int hdrlen; 922 int fragnum; 923 924 /* no matter what happens, tx->skb moves to tx->skbs */ 925 __skb_queue_tail(&tx->skbs, skb); 926 tx->skb = NULL; 927 928 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 929 return TX_CONTINUE; 930 931 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 932 return TX_CONTINUE; 933 934 /* 935 * Warn when submitting a fragmented A-MPDU frame and drop it. 936 * This scenario is handled in ieee80211_tx_prepare but extra 937 * caution taken here as fragmented ampdu may cause Tx stop. 938 */ 939 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 940 return TX_DROP; 941 942 hdrlen = ieee80211_hdrlen(hdr->frame_control); 943 944 /* internal error, why isn't DONTFRAG set? */ 945 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 946 return TX_DROP; 947 948 /* 949 * Now fragment the frame. This will allocate all the fragments and 950 * chain them (using skb as the first fragment) to skb->next. 951 * During transmission, we will remove the successfully transmitted 952 * fragments from this list. When the low-level driver rejects one 953 * of the fragments then we will simply pretend to accept the skb 954 * but store it away as pending. 955 */ 956 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 957 return TX_DROP; 958 959 /* update duration/seq/flags of fragments */ 960 fragnum = 0; 961 962 skb_queue_walk(&tx->skbs, skb) { 963 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 964 965 hdr = (void *)skb->data; 966 info = IEEE80211_SKB_CB(skb); 967 968 if (!skb_queue_is_last(&tx->skbs, skb)) { 969 hdr->frame_control |= morefrags; 970 /* 971 * No multi-rate retries for fragmented frames, that 972 * would completely throw off the NAV at other STAs. 973 */ 974 info->control.rates[1].idx = -1; 975 info->control.rates[2].idx = -1; 976 info->control.rates[3].idx = -1; 977 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 978 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 979 } else { 980 hdr->frame_control &= ~morefrags; 981 } 982 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 983 fragnum++; 984 } 985 986 return TX_CONTINUE; 987 } 988 989 static ieee80211_tx_result debug_noinline 990 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 991 { 992 struct sk_buff *skb; 993 int ac = -1; 994 995 if (!tx->sta) 996 return TX_CONTINUE; 997 998 skb_queue_walk(&tx->skbs, skb) { 999 ac = skb_get_queue_mapping(skb); 1000 tx->sta->tx_stats.bytes[ac] += skb->len; 1001 } 1002 if (ac >= 0) 1003 tx->sta->tx_stats.packets[ac]++; 1004 1005 return TX_CONTINUE; 1006 } 1007 1008 static ieee80211_tx_result debug_noinline 1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1010 { 1011 if (!tx->key) 1012 return TX_CONTINUE; 1013 1014 switch (tx->key->conf.cipher) { 1015 case WLAN_CIPHER_SUITE_WEP40: 1016 case WLAN_CIPHER_SUITE_WEP104: 1017 return ieee80211_crypto_wep_encrypt(tx); 1018 case WLAN_CIPHER_SUITE_TKIP: 1019 return ieee80211_crypto_tkip_encrypt(tx); 1020 case WLAN_CIPHER_SUITE_CCMP: 1021 return ieee80211_crypto_ccmp_encrypt( 1022 tx, IEEE80211_CCMP_MIC_LEN); 1023 case WLAN_CIPHER_SUITE_CCMP_256: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_256_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_AES_CMAC: 1027 return ieee80211_crypto_aes_cmac_encrypt(tx); 1028 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1029 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1030 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1031 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1032 return ieee80211_crypto_aes_gmac_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_GCMP: 1034 case WLAN_CIPHER_SUITE_GCMP_256: 1035 return ieee80211_crypto_gcmp_encrypt(tx); 1036 default: 1037 return ieee80211_crypto_hw_encrypt(tx); 1038 } 1039 1040 return TX_DROP; 1041 } 1042 1043 static ieee80211_tx_result debug_noinline 1044 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1045 { 1046 struct sk_buff *skb; 1047 struct ieee80211_hdr *hdr; 1048 int next_len; 1049 bool group_addr; 1050 1051 skb_queue_walk(&tx->skbs, skb) { 1052 hdr = (void *) skb->data; 1053 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1054 break; /* must not overwrite AID */ 1055 if (!skb_queue_is_last(&tx->skbs, skb)) { 1056 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1057 next_len = next->len; 1058 } else 1059 next_len = 0; 1060 group_addr = is_multicast_ether_addr(hdr->addr1); 1061 1062 hdr->duration_id = 1063 ieee80211_duration(tx, skb, group_addr, next_len); 1064 } 1065 1066 return TX_CONTINUE; 1067 } 1068 1069 /* actual transmit path */ 1070 1071 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1072 struct sk_buff *skb, 1073 struct ieee80211_tx_info *info, 1074 struct tid_ampdu_tx *tid_tx, 1075 int tid) 1076 { 1077 bool queued = false; 1078 bool reset_agg_timer = false; 1079 struct sk_buff *purge_skb = NULL; 1080 1081 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1082 info->flags |= IEEE80211_TX_CTL_AMPDU; 1083 reset_agg_timer = true; 1084 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1085 /* 1086 * nothing -- this aggregation session is being started 1087 * but that might still fail with the driver 1088 */ 1089 } else if (!tx->sta->sta.txq[tid]) { 1090 spin_lock(&tx->sta->lock); 1091 /* 1092 * Need to re-check now, because we may get here 1093 * 1094 * 1) in the window during which the setup is actually 1095 * already done, but not marked yet because not all 1096 * packets are spliced over to the driver pending 1097 * queue yet -- if this happened we acquire the lock 1098 * either before or after the splice happens, but 1099 * need to recheck which of these cases happened. 1100 * 1101 * 2) during session teardown, if the OPERATIONAL bit 1102 * was cleared due to the teardown but the pointer 1103 * hasn't been assigned NULL yet (or we loaded it 1104 * before it was assigned) -- in this case it may 1105 * now be NULL which means we should just let the 1106 * packet pass through because splicing the frames 1107 * back is already done. 1108 */ 1109 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1110 1111 if (!tid_tx) { 1112 /* do nothing, let packet pass through */ 1113 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1114 info->flags |= IEEE80211_TX_CTL_AMPDU; 1115 reset_agg_timer = true; 1116 } else { 1117 queued = true; 1118 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1119 clear_sta_flag(tx->sta, WLAN_STA_SP); 1120 ps_dbg(tx->sta->sdata, 1121 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1122 tx->sta->sta.addr, tx->sta->sta.aid); 1123 } 1124 info->control.vif = &tx->sdata->vif; 1125 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1126 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1127 __skb_queue_tail(&tid_tx->pending, skb); 1128 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1129 purge_skb = __skb_dequeue(&tid_tx->pending); 1130 } 1131 spin_unlock(&tx->sta->lock); 1132 1133 if (purge_skb) 1134 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1135 } 1136 1137 /* reset session timer */ 1138 if (reset_agg_timer && tid_tx->timeout) 1139 tid_tx->last_tx = jiffies; 1140 1141 return queued; 1142 } 1143 1144 /* 1145 * initialises @tx 1146 * pass %NULL for the station if unknown, a valid pointer if known 1147 * or an ERR_PTR() if the station is known not to exist 1148 */ 1149 static ieee80211_tx_result 1150 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1151 struct ieee80211_tx_data *tx, 1152 struct sta_info *sta, struct sk_buff *skb) 1153 { 1154 struct ieee80211_local *local = sdata->local; 1155 struct ieee80211_hdr *hdr; 1156 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1157 int tid; 1158 1159 memset(tx, 0, sizeof(*tx)); 1160 tx->skb = skb; 1161 tx->local = local; 1162 tx->sdata = sdata; 1163 __skb_queue_head_init(&tx->skbs); 1164 1165 /* 1166 * If this flag is set to true anywhere, and we get here, 1167 * we are doing the needed processing, so remove the flag 1168 * now. 1169 */ 1170 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1171 1172 hdr = (struct ieee80211_hdr *) skb->data; 1173 1174 if (likely(sta)) { 1175 if (!IS_ERR(sta)) 1176 tx->sta = sta; 1177 } else { 1178 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1179 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1180 if (!tx->sta && sdata->wdev.use_4addr) 1181 return TX_DROP; 1182 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1183 IEEE80211_TX_CTL_INJECTED) || 1184 tx->sdata->control_port_protocol == tx->skb->protocol) { 1185 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1186 } 1187 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1188 tx->sta = sta_info_get(sdata, hdr->addr1); 1189 } 1190 1191 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1192 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1193 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1194 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1195 struct tid_ampdu_tx *tid_tx; 1196 1197 tid = ieee80211_get_tid(hdr); 1198 1199 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1200 if (tid_tx) { 1201 bool queued; 1202 1203 queued = ieee80211_tx_prep_agg(tx, skb, info, 1204 tid_tx, tid); 1205 1206 if (unlikely(queued)) 1207 return TX_QUEUED; 1208 } 1209 } 1210 1211 if (is_multicast_ether_addr(hdr->addr1)) { 1212 tx->flags &= ~IEEE80211_TX_UNICAST; 1213 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1214 } else 1215 tx->flags |= IEEE80211_TX_UNICAST; 1216 1217 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1218 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1219 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1220 info->flags & IEEE80211_TX_CTL_AMPDU) 1221 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1222 } 1223 1224 if (!tx->sta) 1225 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1226 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1227 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1228 ieee80211_check_fast_xmit(tx->sta); 1229 } 1230 1231 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1232 1233 return TX_CONTINUE; 1234 } 1235 1236 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1237 struct ieee80211_vif *vif, 1238 struct sta_info *sta, 1239 struct sk_buff *skb) 1240 { 1241 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1243 struct ieee80211_txq *txq = NULL; 1244 1245 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1246 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1247 return NULL; 1248 1249 if (!ieee80211_is_data(hdr->frame_control)) 1250 return NULL; 1251 1252 if (sta) { 1253 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1254 1255 if (!sta->uploaded) 1256 return NULL; 1257 1258 txq = sta->sta.txq[tid]; 1259 } else if (vif) { 1260 txq = vif->txq; 1261 } 1262 1263 if (!txq) 1264 return NULL; 1265 1266 return to_txq_info(txq); 1267 } 1268 1269 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1270 { 1271 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1272 } 1273 1274 static u32 codel_skb_len_func(const struct sk_buff *skb) 1275 { 1276 return skb->len; 1277 } 1278 1279 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1280 { 1281 const struct ieee80211_tx_info *info; 1282 1283 info = (const struct ieee80211_tx_info *)skb->cb; 1284 return info->control.enqueue_time; 1285 } 1286 1287 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1288 void *ctx) 1289 { 1290 struct ieee80211_local *local; 1291 struct txq_info *txqi; 1292 struct fq *fq; 1293 struct fq_flow *flow; 1294 1295 txqi = ctx; 1296 local = vif_to_sdata(txqi->txq.vif)->local; 1297 fq = &local->fq; 1298 1299 if (cvars == &txqi->def_cvars) 1300 flow = &txqi->def_flow; 1301 else 1302 flow = &fq->flows[cvars - local->cvars]; 1303 1304 return fq_flow_dequeue(fq, flow); 1305 } 1306 1307 static void codel_drop_func(struct sk_buff *skb, 1308 void *ctx) 1309 { 1310 struct ieee80211_local *local; 1311 struct ieee80211_hw *hw; 1312 struct txq_info *txqi; 1313 1314 txqi = ctx; 1315 local = vif_to_sdata(txqi->txq.vif)->local; 1316 hw = &local->hw; 1317 1318 ieee80211_free_txskb(hw, skb); 1319 } 1320 1321 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1322 struct fq_tin *tin, 1323 struct fq_flow *flow) 1324 { 1325 struct ieee80211_local *local; 1326 struct txq_info *txqi; 1327 struct codel_vars *cvars; 1328 struct codel_params *cparams; 1329 struct codel_stats *cstats; 1330 1331 local = container_of(fq, struct ieee80211_local, fq); 1332 txqi = container_of(tin, struct txq_info, tin); 1333 cstats = &txqi->cstats; 1334 1335 if (txqi->txq.sta) { 1336 struct sta_info *sta = container_of(txqi->txq.sta, 1337 struct sta_info, sta); 1338 cparams = &sta->cparams; 1339 } else { 1340 cparams = &local->cparams; 1341 } 1342 1343 if (flow == &txqi->def_flow) 1344 cvars = &txqi->def_cvars; 1345 else 1346 cvars = &local->cvars[flow - fq->flows]; 1347 1348 return codel_dequeue(txqi, 1349 &flow->backlog, 1350 cparams, 1351 cvars, 1352 cstats, 1353 codel_skb_len_func, 1354 codel_skb_time_func, 1355 codel_drop_func, 1356 codel_dequeue_func); 1357 } 1358 1359 static void fq_skb_free_func(struct fq *fq, 1360 struct fq_tin *tin, 1361 struct fq_flow *flow, 1362 struct sk_buff *skb) 1363 { 1364 struct ieee80211_local *local; 1365 1366 local = container_of(fq, struct ieee80211_local, fq); 1367 ieee80211_free_txskb(&local->hw, skb); 1368 } 1369 1370 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1371 struct fq_tin *tin, 1372 int idx, 1373 struct sk_buff *skb) 1374 { 1375 struct txq_info *txqi; 1376 1377 txqi = container_of(tin, struct txq_info, tin); 1378 return &txqi->def_flow; 1379 } 1380 1381 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1382 struct txq_info *txqi, 1383 struct sk_buff *skb) 1384 { 1385 struct fq *fq = &local->fq; 1386 struct fq_tin *tin = &txqi->tin; 1387 1388 ieee80211_set_skb_enqueue_time(skb); 1389 fq_tin_enqueue(fq, tin, skb, 1390 fq_skb_free_func, 1391 fq_flow_get_default_func); 1392 } 1393 1394 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1395 struct fq_flow *flow, struct sk_buff *skb, 1396 void *data) 1397 { 1398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1399 1400 return info->control.vif == data; 1401 } 1402 1403 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1404 struct ieee80211_sub_if_data *sdata) 1405 { 1406 struct fq *fq = &local->fq; 1407 struct txq_info *txqi; 1408 struct fq_tin *tin; 1409 struct ieee80211_sub_if_data *ap; 1410 1411 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1412 return; 1413 1414 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1415 1416 if (!ap->vif.txq) 1417 return; 1418 1419 txqi = to_txq_info(ap->vif.txq); 1420 tin = &txqi->tin; 1421 1422 spin_lock_bh(&fq->lock); 1423 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1424 fq_skb_free_func); 1425 spin_unlock_bh(&fq->lock); 1426 } 1427 1428 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1429 struct sta_info *sta, 1430 struct txq_info *txqi, int tid) 1431 { 1432 fq_tin_init(&txqi->tin); 1433 fq_flow_init(&txqi->def_flow); 1434 codel_vars_init(&txqi->def_cvars); 1435 codel_stats_init(&txqi->cstats); 1436 __skb_queue_head_init(&txqi->frags); 1437 1438 txqi->txq.vif = &sdata->vif; 1439 1440 if (sta) { 1441 txqi->txq.sta = &sta->sta; 1442 sta->sta.txq[tid] = &txqi->txq; 1443 txqi->txq.tid = tid; 1444 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1445 } else { 1446 sdata->vif.txq = &txqi->txq; 1447 txqi->txq.tid = 0; 1448 txqi->txq.ac = IEEE80211_AC_BE; 1449 } 1450 } 1451 1452 void ieee80211_txq_purge(struct ieee80211_local *local, 1453 struct txq_info *txqi) 1454 { 1455 struct fq *fq = &local->fq; 1456 struct fq_tin *tin = &txqi->tin; 1457 1458 fq_tin_reset(fq, tin, fq_skb_free_func); 1459 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1460 } 1461 1462 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1463 { 1464 struct fq *fq = &local->fq; 1465 int ret; 1466 int i; 1467 bool supp_vht = false; 1468 enum nl80211_band band; 1469 1470 if (!local->ops->wake_tx_queue) 1471 return 0; 1472 1473 ret = fq_init(fq, 4096); 1474 if (ret) 1475 return ret; 1476 1477 /* 1478 * If the hardware doesn't support VHT, it is safe to limit the maximum 1479 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1480 */ 1481 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1482 struct ieee80211_supported_band *sband; 1483 1484 sband = local->hw.wiphy->bands[band]; 1485 if (!sband) 1486 continue; 1487 1488 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1489 } 1490 1491 if (!supp_vht) 1492 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1493 1494 codel_params_init(&local->cparams); 1495 local->cparams.interval = MS2TIME(100); 1496 local->cparams.target = MS2TIME(20); 1497 local->cparams.ecn = true; 1498 1499 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1500 GFP_KERNEL); 1501 if (!local->cvars) { 1502 spin_lock_bh(&fq->lock); 1503 fq_reset(fq, fq_skb_free_func); 1504 spin_unlock_bh(&fq->lock); 1505 return -ENOMEM; 1506 } 1507 1508 for (i = 0; i < fq->flows_cnt; i++) 1509 codel_vars_init(&local->cvars[i]); 1510 1511 return 0; 1512 } 1513 1514 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1515 { 1516 struct fq *fq = &local->fq; 1517 1518 if (!local->ops->wake_tx_queue) 1519 return; 1520 1521 kfree(local->cvars); 1522 local->cvars = NULL; 1523 1524 spin_lock_bh(&fq->lock); 1525 fq_reset(fq, fq_skb_free_func); 1526 spin_unlock_bh(&fq->lock); 1527 } 1528 1529 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1530 struct ieee80211_sub_if_data *sdata, 1531 struct sta_info *sta, 1532 struct sk_buff *skb) 1533 { 1534 struct fq *fq = &local->fq; 1535 struct ieee80211_vif *vif; 1536 struct txq_info *txqi; 1537 1538 if (!local->ops->wake_tx_queue || 1539 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1540 return false; 1541 1542 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1543 sdata = container_of(sdata->bss, 1544 struct ieee80211_sub_if_data, u.ap); 1545 1546 vif = &sdata->vif; 1547 txqi = ieee80211_get_txq(local, vif, sta, skb); 1548 1549 if (!txqi) 1550 return false; 1551 1552 spin_lock_bh(&fq->lock); 1553 ieee80211_txq_enqueue(local, txqi, skb); 1554 spin_unlock_bh(&fq->lock); 1555 1556 drv_wake_tx_queue(local, txqi); 1557 1558 return true; 1559 } 1560 1561 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1562 struct ieee80211_vif *vif, 1563 struct ieee80211_sta *sta, 1564 struct sk_buff_head *skbs, 1565 bool txpending) 1566 { 1567 struct ieee80211_tx_control control = {}; 1568 struct sk_buff *skb, *tmp; 1569 unsigned long flags; 1570 1571 skb_queue_walk_safe(skbs, skb, tmp) { 1572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1573 int q = info->hw_queue; 1574 1575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1576 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1577 __skb_unlink(skb, skbs); 1578 ieee80211_free_txskb(&local->hw, skb); 1579 continue; 1580 } 1581 #endif 1582 1583 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1584 if (local->queue_stop_reasons[q] || 1585 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1586 if (unlikely(info->flags & 1587 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1588 if (local->queue_stop_reasons[q] & 1589 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1590 /* 1591 * Drop off-channel frames if queues 1592 * are stopped for any reason other 1593 * than off-channel operation. Never 1594 * queue them. 1595 */ 1596 spin_unlock_irqrestore( 1597 &local->queue_stop_reason_lock, 1598 flags); 1599 ieee80211_purge_tx_queue(&local->hw, 1600 skbs); 1601 return true; 1602 } 1603 } else { 1604 1605 /* 1606 * Since queue is stopped, queue up frames for 1607 * later transmission from the tx-pending 1608 * tasklet when the queue is woken again. 1609 */ 1610 if (txpending) 1611 skb_queue_splice_init(skbs, 1612 &local->pending[q]); 1613 else 1614 skb_queue_splice_tail_init(skbs, 1615 &local->pending[q]); 1616 1617 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1618 flags); 1619 return false; 1620 } 1621 } 1622 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1623 1624 info->control.vif = vif; 1625 control.sta = sta; 1626 1627 __skb_unlink(skb, skbs); 1628 drv_tx(local, &control, skb); 1629 } 1630 1631 return true; 1632 } 1633 1634 /* 1635 * Returns false if the frame couldn't be transmitted but was queued instead. 1636 */ 1637 static bool __ieee80211_tx(struct ieee80211_local *local, 1638 struct sk_buff_head *skbs, int led_len, 1639 struct sta_info *sta, bool txpending) 1640 { 1641 struct ieee80211_tx_info *info; 1642 struct ieee80211_sub_if_data *sdata; 1643 struct ieee80211_vif *vif; 1644 struct ieee80211_sta *pubsta; 1645 struct sk_buff *skb; 1646 bool result = true; 1647 __le16 fc; 1648 1649 if (WARN_ON(skb_queue_empty(skbs))) 1650 return true; 1651 1652 skb = skb_peek(skbs); 1653 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1654 info = IEEE80211_SKB_CB(skb); 1655 sdata = vif_to_sdata(info->control.vif); 1656 if (sta && !sta->uploaded) 1657 sta = NULL; 1658 1659 if (sta) 1660 pubsta = &sta->sta; 1661 else 1662 pubsta = NULL; 1663 1664 switch (sdata->vif.type) { 1665 case NL80211_IFTYPE_MONITOR: 1666 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1667 vif = &sdata->vif; 1668 break; 1669 } 1670 sdata = rcu_dereference(local->monitor_sdata); 1671 if (sdata) { 1672 vif = &sdata->vif; 1673 info->hw_queue = 1674 vif->hw_queue[skb_get_queue_mapping(skb)]; 1675 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1676 ieee80211_purge_tx_queue(&local->hw, skbs); 1677 return true; 1678 } else 1679 vif = NULL; 1680 break; 1681 case NL80211_IFTYPE_AP_VLAN: 1682 sdata = container_of(sdata->bss, 1683 struct ieee80211_sub_if_data, u.ap); 1684 /* fall through */ 1685 default: 1686 vif = &sdata->vif; 1687 break; 1688 } 1689 1690 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1691 txpending); 1692 1693 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1694 1695 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1696 1697 return result; 1698 } 1699 1700 /* 1701 * Invoke TX handlers, return 0 on success and non-zero if the 1702 * frame was dropped or queued. 1703 * 1704 * The handlers are split into an early and late part. The latter is everything 1705 * that can be sensitive to reordering, and will be deferred to after packets 1706 * are dequeued from the intermediate queues (when they are enabled). 1707 */ 1708 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1709 { 1710 ieee80211_tx_result res = TX_DROP; 1711 1712 #define CALL_TXH(txh) \ 1713 do { \ 1714 res = txh(tx); \ 1715 if (res != TX_CONTINUE) \ 1716 goto txh_done; \ 1717 } while (0) 1718 1719 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1720 CALL_TXH(ieee80211_tx_h_check_assoc); 1721 CALL_TXH(ieee80211_tx_h_ps_buf); 1722 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1723 CALL_TXH(ieee80211_tx_h_select_key); 1724 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1725 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1726 1727 txh_done: 1728 if (unlikely(res == TX_DROP)) { 1729 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1730 if (tx->skb) 1731 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1732 else 1733 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1734 return -1; 1735 } else if (unlikely(res == TX_QUEUED)) { 1736 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1737 return -1; 1738 } 1739 1740 return 0; 1741 } 1742 1743 /* 1744 * Late handlers can be called while the sta lock is held. Handlers that can 1745 * cause packets to be generated will cause deadlock! 1746 */ 1747 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1748 { 1749 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1750 ieee80211_tx_result res = TX_CONTINUE; 1751 1752 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1753 __skb_queue_tail(&tx->skbs, tx->skb); 1754 tx->skb = NULL; 1755 goto txh_done; 1756 } 1757 1758 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1759 CALL_TXH(ieee80211_tx_h_sequence); 1760 CALL_TXH(ieee80211_tx_h_fragment); 1761 /* handlers after fragment must be aware of tx info fragmentation! */ 1762 CALL_TXH(ieee80211_tx_h_stats); 1763 CALL_TXH(ieee80211_tx_h_encrypt); 1764 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1765 CALL_TXH(ieee80211_tx_h_calculate_duration); 1766 #undef CALL_TXH 1767 1768 txh_done: 1769 if (unlikely(res == TX_DROP)) { 1770 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1771 if (tx->skb) 1772 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1773 else 1774 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1775 return -1; 1776 } else if (unlikely(res == TX_QUEUED)) { 1777 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1778 return -1; 1779 } 1780 1781 return 0; 1782 } 1783 1784 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1785 { 1786 int r = invoke_tx_handlers_early(tx); 1787 1788 if (r) 1789 return r; 1790 return invoke_tx_handlers_late(tx); 1791 } 1792 1793 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1794 struct ieee80211_vif *vif, struct sk_buff *skb, 1795 int band, struct ieee80211_sta **sta) 1796 { 1797 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1799 struct ieee80211_tx_data tx; 1800 struct sk_buff *skb2; 1801 1802 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1803 return false; 1804 1805 info->band = band; 1806 info->control.vif = vif; 1807 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1808 1809 if (invoke_tx_handlers(&tx)) 1810 return false; 1811 1812 if (sta) { 1813 if (tx.sta) 1814 *sta = &tx.sta->sta; 1815 else 1816 *sta = NULL; 1817 } 1818 1819 /* this function isn't suitable for fragmented data frames */ 1820 skb2 = __skb_dequeue(&tx.skbs); 1821 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1822 ieee80211_free_txskb(hw, skb2); 1823 ieee80211_purge_tx_queue(hw, &tx.skbs); 1824 return false; 1825 } 1826 1827 return true; 1828 } 1829 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1830 1831 /* 1832 * Returns false if the frame couldn't be transmitted but was queued instead. 1833 */ 1834 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1835 struct sta_info *sta, struct sk_buff *skb, 1836 bool txpending) 1837 { 1838 struct ieee80211_local *local = sdata->local; 1839 struct ieee80211_tx_data tx; 1840 ieee80211_tx_result res_prepare; 1841 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1842 bool result = true; 1843 int led_len; 1844 1845 if (unlikely(skb->len < 10)) { 1846 dev_kfree_skb(skb); 1847 return true; 1848 } 1849 1850 /* initialises tx */ 1851 led_len = skb->len; 1852 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1853 1854 if (unlikely(res_prepare == TX_DROP)) { 1855 ieee80211_free_txskb(&local->hw, skb); 1856 return true; 1857 } else if (unlikely(res_prepare == TX_QUEUED)) { 1858 return true; 1859 } 1860 1861 /* set up hw_queue value early */ 1862 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1863 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1864 info->hw_queue = 1865 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1866 1867 if (invoke_tx_handlers_early(&tx)) 1868 return false; 1869 1870 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1871 return true; 1872 1873 if (!invoke_tx_handlers_late(&tx)) 1874 result = __ieee80211_tx(local, &tx.skbs, led_len, 1875 tx.sta, txpending); 1876 1877 return result; 1878 } 1879 1880 /* device xmit handlers */ 1881 1882 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1883 struct sk_buff *skb, 1884 int head_need, bool may_encrypt) 1885 { 1886 struct ieee80211_local *local = sdata->local; 1887 int tail_need = 0; 1888 1889 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1890 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1891 tail_need -= skb_tailroom(skb); 1892 tail_need = max_t(int, tail_need, 0); 1893 } 1894 1895 if (skb_cloned(skb) && 1896 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1897 !skb_clone_writable(skb, ETH_HLEN) || 1898 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1899 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1900 else if (head_need || tail_need) 1901 I802_DEBUG_INC(local->tx_expand_skb_head); 1902 else 1903 return 0; 1904 1905 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1906 wiphy_debug(local->hw.wiphy, 1907 "failed to reallocate TX buffer\n"); 1908 return -ENOMEM; 1909 } 1910 1911 return 0; 1912 } 1913 1914 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1915 struct sta_info *sta, struct sk_buff *skb) 1916 { 1917 struct ieee80211_local *local = sdata->local; 1918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1919 struct ieee80211_hdr *hdr; 1920 int headroom; 1921 bool may_encrypt; 1922 1923 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1924 1925 headroom = local->tx_headroom; 1926 if (may_encrypt) 1927 headroom += sdata->encrypt_headroom; 1928 headroom -= skb_headroom(skb); 1929 headroom = max_t(int, 0, headroom); 1930 1931 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1932 ieee80211_free_txskb(&local->hw, skb); 1933 return; 1934 } 1935 1936 hdr = (struct ieee80211_hdr *) skb->data; 1937 info->control.vif = &sdata->vif; 1938 1939 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1940 if (ieee80211_is_data(hdr->frame_control) && 1941 is_unicast_ether_addr(hdr->addr1)) { 1942 if (mesh_nexthop_resolve(sdata, skb)) 1943 return; /* skb queued: don't free */ 1944 } else { 1945 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1946 } 1947 } 1948 1949 ieee80211_set_qos_hdr(sdata, skb); 1950 ieee80211_tx(sdata, sta, skb, false); 1951 } 1952 1953 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1954 struct sk_buff *skb) 1955 { 1956 struct ieee80211_radiotap_iterator iterator; 1957 struct ieee80211_radiotap_header *rthdr = 1958 (struct ieee80211_radiotap_header *) skb->data; 1959 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1960 struct ieee80211_supported_band *sband = 1961 local->hw.wiphy->bands[info->band]; 1962 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1963 NULL); 1964 u16 txflags; 1965 u16 rate = 0; 1966 bool rate_found = false; 1967 u8 rate_retries = 0; 1968 u16 rate_flags = 0; 1969 u8 mcs_known, mcs_flags, mcs_bw; 1970 u16 vht_known; 1971 u8 vht_mcs = 0, vht_nss = 0; 1972 int i; 1973 1974 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1975 IEEE80211_TX_CTL_DONTFRAG; 1976 1977 /* 1978 * for every radiotap entry that is present 1979 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1980 * entries present, or -EINVAL on error) 1981 */ 1982 1983 while (!ret) { 1984 ret = ieee80211_radiotap_iterator_next(&iterator); 1985 1986 if (ret) 1987 continue; 1988 1989 /* see if this argument is something we can use */ 1990 switch (iterator.this_arg_index) { 1991 /* 1992 * You must take care when dereferencing iterator.this_arg 1993 * for multibyte types... the pointer is not aligned. Use 1994 * get_unaligned((type *)iterator.this_arg) to dereference 1995 * iterator.this_arg for type "type" safely on all arches. 1996 */ 1997 case IEEE80211_RADIOTAP_FLAGS: 1998 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1999 /* 2000 * this indicates that the skb we have been 2001 * handed has the 32-bit FCS CRC at the end... 2002 * we should react to that by snipping it off 2003 * because it will be recomputed and added 2004 * on transmission 2005 */ 2006 if (skb->len < (iterator._max_length + FCS_LEN)) 2007 return false; 2008 2009 skb_trim(skb, skb->len - FCS_LEN); 2010 } 2011 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2012 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2013 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2014 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2015 break; 2016 2017 case IEEE80211_RADIOTAP_TX_FLAGS: 2018 txflags = get_unaligned_le16(iterator.this_arg); 2019 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2020 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2021 break; 2022 2023 case IEEE80211_RADIOTAP_RATE: 2024 rate = *iterator.this_arg; 2025 rate_flags = 0; 2026 rate_found = true; 2027 break; 2028 2029 case IEEE80211_RADIOTAP_DATA_RETRIES: 2030 rate_retries = *iterator.this_arg; 2031 break; 2032 2033 case IEEE80211_RADIOTAP_MCS: 2034 mcs_known = iterator.this_arg[0]; 2035 mcs_flags = iterator.this_arg[1]; 2036 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2037 break; 2038 2039 rate_found = true; 2040 rate = iterator.this_arg[2]; 2041 rate_flags = IEEE80211_TX_RC_MCS; 2042 2043 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2044 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2045 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2046 2047 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2048 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2049 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2050 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2051 break; 2052 2053 case IEEE80211_RADIOTAP_VHT: 2054 vht_known = get_unaligned_le16(iterator.this_arg); 2055 rate_found = true; 2056 2057 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2058 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2059 (iterator.this_arg[2] & 2060 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2061 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2062 if (vht_known & 2063 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2064 if (iterator.this_arg[3] == 1) 2065 rate_flags |= 2066 IEEE80211_TX_RC_40_MHZ_WIDTH; 2067 else if (iterator.this_arg[3] == 4) 2068 rate_flags |= 2069 IEEE80211_TX_RC_80_MHZ_WIDTH; 2070 else if (iterator.this_arg[3] == 11) 2071 rate_flags |= 2072 IEEE80211_TX_RC_160_MHZ_WIDTH; 2073 } 2074 2075 vht_mcs = iterator.this_arg[4] >> 4; 2076 vht_nss = iterator.this_arg[4] & 0xF; 2077 break; 2078 2079 /* 2080 * Please update the file 2081 * Documentation/networking/mac80211-injection.txt 2082 * when parsing new fields here. 2083 */ 2084 2085 default: 2086 break; 2087 } 2088 } 2089 2090 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2091 return false; 2092 2093 if (rate_found) { 2094 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2095 2096 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2097 info->control.rates[i].idx = -1; 2098 info->control.rates[i].flags = 0; 2099 info->control.rates[i].count = 0; 2100 } 2101 2102 if (rate_flags & IEEE80211_TX_RC_MCS) { 2103 info->control.rates[0].idx = rate; 2104 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2105 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2106 vht_nss); 2107 } else { 2108 for (i = 0; i < sband->n_bitrates; i++) { 2109 if (rate * 5 != sband->bitrates[i].bitrate) 2110 continue; 2111 2112 info->control.rates[0].idx = i; 2113 break; 2114 } 2115 } 2116 2117 if (info->control.rates[0].idx < 0) 2118 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2119 2120 info->control.rates[0].flags = rate_flags; 2121 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2122 local->hw.max_rate_tries); 2123 } 2124 2125 /* 2126 * remove the radiotap header 2127 * iterator->_max_length was sanity-checked against 2128 * skb->len by iterator init 2129 */ 2130 skb_pull(skb, iterator._max_length); 2131 2132 return true; 2133 } 2134 2135 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2136 struct net_device *dev) 2137 { 2138 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2139 struct ieee80211_chanctx_conf *chanctx_conf; 2140 struct ieee80211_radiotap_header *prthdr = 2141 (struct ieee80211_radiotap_header *)skb->data; 2142 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2143 struct ieee80211_hdr *hdr; 2144 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2145 struct cfg80211_chan_def *chandef; 2146 u16 len_rthdr; 2147 int hdrlen; 2148 2149 /* check for not even having the fixed radiotap header part */ 2150 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2151 goto fail; /* too short to be possibly valid */ 2152 2153 /* is it a header version we can trust to find length from? */ 2154 if (unlikely(prthdr->it_version)) 2155 goto fail; /* only version 0 is supported */ 2156 2157 /* then there must be a radiotap header with a length we can use */ 2158 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2159 2160 /* does the skb contain enough to deliver on the alleged length? */ 2161 if (unlikely(skb->len < len_rthdr)) 2162 goto fail; /* skb too short for claimed rt header extent */ 2163 2164 /* 2165 * fix up the pointers accounting for the radiotap 2166 * header still being in there. We are being given 2167 * a precooked IEEE80211 header so no need for 2168 * normal processing 2169 */ 2170 skb_set_mac_header(skb, len_rthdr); 2171 /* 2172 * these are just fixed to the end of the rt area since we 2173 * don't have any better information and at this point, nobody cares 2174 */ 2175 skb_set_network_header(skb, len_rthdr); 2176 skb_set_transport_header(skb, len_rthdr); 2177 2178 if (skb->len < len_rthdr + 2) 2179 goto fail; 2180 2181 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2182 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2183 2184 if (skb->len < len_rthdr + hdrlen) 2185 goto fail; 2186 2187 /* 2188 * Initialize skb->protocol if the injected frame is a data frame 2189 * carrying a rfc1042 header 2190 */ 2191 if (ieee80211_is_data(hdr->frame_control) && 2192 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2193 u8 *payload = (u8 *)hdr + hdrlen; 2194 2195 if (ether_addr_equal(payload, rfc1042_header)) 2196 skb->protocol = cpu_to_be16((payload[6] << 8) | 2197 payload[7]); 2198 } 2199 2200 memset(info, 0, sizeof(*info)); 2201 2202 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2203 IEEE80211_TX_CTL_INJECTED; 2204 2205 rcu_read_lock(); 2206 2207 /* 2208 * We process outgoing injected frames that have a local address 2209 * we handle as though they are non-injected frames. 2210 * This code here isn't entirely correct, the local MAC address 2211 * isn't always enough to find the interface to use; for proper 2212 * VLAN/WDS support we will need a different mechanism (which 2213 * likely isn't going to be monitor interfaces). 2214 */ 2215 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2216 2217 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2218 if (!ieee80211_sdata_running(tmp_sdata)) 2219 continue; 2220 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2221 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2222 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2223 continue; 2224 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2225 sdata = tmp_sdata; 2226 break; 2227 } 2228 } 2229 2230 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2231 if (!chanctx_conf) { 2232 tmp_sdata = rcu_dereference(local->monitor_sdata); 2233 if (tmp_sdata) 2234 chanctx_conf = 2235 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2236 } 2237 2238 if (chanctx_conf) 2239 chandef = &chanctx_conf->def; 2240 else if (!local->use_chanctx) 2241 chandef = &local->_oper_chandef; 2242 else 2243 goto fail_rcu; 2244 2245 /* 2246 * Frame injection is not allowed if beaconing is not allowed 2247 * or if we need radar detection. Beaconing is usually not allowed when 2248 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2249 * Passive scan is also used in world regulatory domains where 2250 * your country is not known and as such it should be treated as 2251 * NO TX unless the channel is explicitly allowed in which case 2252 * your current regulatory domain would not have the passive scan 2253 * flag. 2254 * 2255 * Since AP mode uses monitor interfaces to inject/TX management 2256 * frames we can make AP mode the exception to this rule once it 2257 * supports radar detection as its implementation can deal with 2258 * radar detection by itself. We can do that later by adding a 2259 * monitor flag interfaces used for AP support. 2260 */ 2261 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2262 sdata->vif.type)) 2263 goto fail_rcu; 2264 2265 info->band = chandef->chan->band; 2266 2267 /* process and remove the injection radiotap header */ 2268 if (!ieee80211_parse_tx_radiotap(local, skb)) 2269 goto fail_rcu; 2270 2271 ieee80211_xmit(sdata, NULL, skb); 2272 rcu_read_unlock(); 2273 2274 return NETDEV_TX_OK; 2275 2276 fail_rcu: 2277 rcu_read_unlock(); 2278 fail: 2279 dev_kfree_skb(skb); 2280 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2281 } 2282 2283 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2284 { 2285 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2286 2287 return ethertype == ETH_P_TDLS && 2288 skb->len > 14 && 2289 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2290 } 2291 2292 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2293 struct sk_buff *skb, 2294 struct sta_info **sta_out) 2295 { 2296 struct sta_info *sta; 2297 2298 switch (sdata->vif.type) { 2299 case NL80211_IFTYPE_AP_VLAN: 2300 sta = rcu_dereference(sdata->u.vlan.sta); 2301 if (sta) { 2302 *sta_out = sta; 2303 return 0; 2304 } else if (sdata->wdev.use_4addr) { 2305 return -ENOLINK; 2306 } 2307 /* fall through */ 2308 case NL80211_IFTYPE_AP: 2309 case NL80211_IFTYPE_OCB: 2310 case NL80211_IFTYPE_ADHOC: 2311 if (is_multicast_ether_addr(skb->data)) { 2312 *sta_out = ERR_PTR(-ENOENT); 2313 return 0; 2314 } 2315 sta = sta_info_get_bss(sdata, skb->data); 2316 break; 2317 case NL80211_IFTYPE_WDS: 2318 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2319 break; 2320 #ifdef CONFIG_MAC80211_MESH 2321 case NL80211_IFTYPE_MESH_POINT: 2322 /* determined much later */ 2323 *sta_out = NULL; 2324 return 0; 2325 #endif 2326 case NL80211_IFTYPE_STATION: 2327 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2328 sta = sta_info_get(sdata, skb->data); 2329 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2330 if (test_sta_flag(sta, 2331 WLAN_STA_TDLS_PEER_AUTH)) { 2332 *sta_out = sta; 2333 return 0; 2334 } 2335 2336 /* 2337 * TDLS link during setup - throw out frames to 2338 * peer. Allow TDLS-setup frames to unauthorized 2339 * peers for the special case of a link teardown 2340 * after a TDLS sta is removed due to being 2341 * unreachable. 2342 */ 2343 if (!ieee80211_is_tdls_setup(skb)) 2344 return -EINVAL; 2345 } 2346 2347 } 2348 2349 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2350 if (!sta) 2351 return -ENOLINK; 2352 break; 2353 default: 2354 return -EINVAL; 2355 } 2356 2357 *sta_out = sta ?: ERR_PTR(-ENOENT); 2358 return 0; 2359 } 2360 2361 /** 2362 * ieee80211_build_hdr - build 802.11 header in the given frame 2363 * @sdata: virtual interface to build the header for 2364 * @skb: the skb to build the header in 2365 * @info_flags: skb flags to set 2366 * 2367 * This function takes the skb with 802.3 header and reformats the header to 2368 * the appropriate IEEE 802.11 header based on which interface the packet is 2369 * being transmitted on. 2370 * 2371 * Note that this function also takes care of the TX status request and 2372 * potential unsharing of the SKB - this needs to be interleaved with the 2373 * header building. 2374 * 2375 * The function requires the read-side RCU lock held 2376 * 2377 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2378 */ 2379 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2380 struct sk_buff *skb, u32 info_flags, 2381 struct sta_info *sta) 2382 { 2383 struct ieee80211_local *local = sdata->local; 2384 struct ieee80211_tx_info *info; 2385 int head_need; 2386 u16 ethertype, hdrlen, meshhdrlen = 0; 2387 __le16 fc; 2388 struct ieee80211_hdr hdr; 2389 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2390 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2391 const u8 *encaps_data; 2392 int encaps_len, skip_header_bytes; 2393 bool wme_sta = false, authorized = false; 2394 bool tdls_peer; 2395 bool multicast; 2396 u16 info_id = 0; 2397 struct ieee80211_chanctx_conf *chanctx_conf; 2398 struct ieee80211_sub_if_data *ap_sdata; 2399 enum nl80211_band band; 2400 int ret; 2401 2402 if (IS_ERR(sta)) 2403 sta = NULL; 2404 2405 /* convert Ethernet header to proper 802.11 header (based on 2406 * operation mode) */ 2407 ethertype = (skb->data[12] << 8) | skb->data[13]; 2408 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2409 2410 switch (sdata->vif.type) { 2411 case NL80211_IFTYPE_AP_VLAN: 2412 if (sdata->wdev.use_4addr) { 2413 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2414 /* RA TA DA SA */ 2415 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2416 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2417 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2418 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2419 hdrlen = 30; 2420 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2421 wme_sta = sta->sta.wme; 2422 } 2423 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2424 u.ap); 2425 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2426 if (!chanctx_conf) { 2427 ret = -ENOTCONN; 2428 goto free; 2429 } 2430 band = chanctx_conf->def.chan->band; 2431 if (sdata->wdev.use_4addr) 2432 break; 2433 /* fall through */ 2434 case NL80211_IFTYPE_AP: 2435 if (sdata->vif.type == NL80211_IFTYPE_AP) 2436 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2437 if (!chanctx_conf) { 2438 ret = -ENOTCONN; 2439 goto free; 2440 } 2441 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2442 /* DA BSSID SA */ 2443 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2444 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2445 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2446 hdrlen = 24; 2447 band = chanctx_conf->def.chan->band; 2448 break; 2449 case NL80211_IFTYPE_WDS: 2450 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2451 /* RA TA DA SA */ 2452 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2453 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2454 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2455 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2456 hdrlen = 30; 2457 /* 2458 * This is the exception! WDS style interfaces are prohibited 2459 * when channel contexts are in used so this must be valid 2460 */ 2461 band = local->hw.conf.chandef.chan->band; 2462 break; 2463 #ifdef CONFIG_MAC80211_MESH 2464 case NL80211_IFTYPE_MESH_POINT: 2465 if (!is_multicast_ether_addr(skb->data)) { 2466 struct sta_info *next_hop; 2467 bool mpp_lookup = true; 2468 2469 mpath = mesh_path_lookup(sdata, skb->data); 2470 if (mpath) { 2471 mpp_lookup = false; 2472 next_hop = rcu_dereference(mpath->next_hop); 2473 if (!next_hop || 2474 !(mpath->flags & (MESH_PATH_ACTIVE | 2475 MESH_PATH_RESOLVING))) 2476 mpp_lookup = true; 2477 } 2478 2479 if (mpp_lookup) { 2480 mppath = mpp_path_lookup(sdata, skb->data); 2481 if (mppath) 2482 mppath->exp_time = jiffies; 2483 } 2484 2485 if (mppath && mpath) 2486 mesh_path_del(sdata, mpath->dst); 2487 } 2488 2489 /* 2490 * Use address extension if it is a packet from 2491 * another interface or if we know the destination 2492 * is being proxied by a portal (i.e. portal address 2493 * differs from proxied address) 2494 */ 2495 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2496 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2497 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2498 skb->data, skb->data + ETH_ALEN); 2499 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2500 NULL, NULL); 2501 } else { 2502 /* DS -> MBSS (802.11-2012 13.11.3.3). 2503 * For unicast with unknown forwarding information, 2504 * destination might be in the MBSS or if that fails 2505 * forwarded to another mesh gate. In either case 2506 * resolution will be handled in ieee80211_xmit(), so 2507 * leave the original DA. This also works for mcast */ 2508 const u8 *mesh_da = skb->data; 2509 2510 if (mppath) 2511 mesh_da = mppath->mpp; 2512 else if (mpath) 2513 mesh_da = mpath->dst; 2514 2515 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2516 mesh_da, sdata->vif.addr); 2517 if (is_multicast_ether_addr(mesh_da)) 2518 /* DA TA mSA AE:SA */ 2519 meshhdrlen = ieee80211_new_mesh_header( 2520 sdata, &mesh_hdr, 2521 skb->data + ETH_ALEN, NULL); 2522 else 2523 /* RA TA mDA mSA AE:DA SA */ 2524 meshhdrlen = ieee80211_new_mesh_header( 2525 sdata, &mesh_hdr, skb->data, 2526 skb->data + ETH_ALEN); 2527 2528 } 2529 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2530 if (!chanctx_conf) { 2531 ret = -ENOTCONN; 2532 goto free; 2533 } 2534 band = chanctx_conf->def.chan->band; 2535 break; 2536 #endif 2537 case NL80211_IFTYPE_STATION: 2538 /* we already did checks when looking up the RA STA */ 2539 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2540 2541 if (tdls_peer) { 2542 /* DA SA BSSID */ 2543 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2544 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2545 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2546 hdrlen = 24; 2547 } else if (sdata->u.mgd.use_4addr && 2548 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2549 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2550 IEEE80211_FCTL_TODS); 2551 /* RA TA DA SA */ 2552 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2553 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2554 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2555 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2556 hdrlen = 30; 2557 } else { 2558 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2559 /* BSSID SA DA */ 2560 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2561 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2562 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2563 hdrlen = 24; 2564 } 2565 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2566 if (!chanctx_conf) { 2567 ret = -ENOTCONN; 2568 goto free; 2569 } 2570 band = chanctx_conf->def.chan->band; 2571 break; 2572 case NL80211_IFTYPE_OCB: 2573 /* DA SA BSSID */ 2574 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2575 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2576 eth_broadcast_addr(hdr.addr3); 2577 hdrlen = 24; 2578 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2579 if (!chanctx_conf) { 2580 ret = -ENOTCONN; 2581 goto free; 2582 } 2583 band = chanctx_conf->def.chan->band; 2584 break; 2585 case NL80211_IFTYPE_ADHOC: 2586 /* DA SA BSSID */ 2587 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2588 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2589 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2590 hdrlen = 24; 2591 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2592 if (!chanctx_conf) { 2593 ret = -ENOTCONN; 2594 goto free; 2595 } 2596 band = chanctx_conf->def.chan->band; 2597 break; 2598 default: 2599 ret = -EINVAL; 2600 goto free; 2601 } 2602 2603 multicast = is_multicast_ether_addr(hdr.addr1); 2604 2605 /* sta is always NULL for mesh */ 2606 if (sta) { 2607 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2608 wme_sta = sta->sta.wme; 2609 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2610 /* For mesh, the use of the QoS header is mandatory */ 2611 wme_sta = true; 2612 } 2613 2614 /* receiver does QoS (which also means we do) use it */ 2615 if (wme_sta) { 2616 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2617 hdrlen += 2; 2618 } 2619 2620 /* 2621 * Drop unicast frames to unauthorised stations unless they are 2622 * EAPOL frames from the local station. 2623 */ 2624 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2625 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2626 !multicast && !authorized && 2627 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2628 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2629 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2630 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2631 sdata->name, hdr.addr1); 2632 #endif 2633 2634 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2635 2636 ret = -EPERM; 2637 goto free; 2638 } 2639 2640 if (unlikely(!multicast && skb->sk && 2641 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2642 struct sk_buff *ack_skb = skb_clone_sk(skb); 2643 2644 if (ack_skb) { 2645 unsigned long flags; 2646 int id; 2647 2648 spin_lock_irqsave(&local->ack_status_lock, flags); 2649 id = idr_alloc(&local->ack_status_frames, ack_skb, 2650 1, 0x10000, GFP_ATOMIC); 2651 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2652 2653 if (id >= 0) { 2654 info_id = id; 2655 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2656 } else { 2657 kfree_skb(ack_skb); 2658 } 2659 } 2660 } 2661 2662 /* 2663 * If the skb is shared we need to obtain our own copy. 2664 */ 2665 if (skb_shared(skb)) { 2666 struct sk_buff *tmp_skb = skb; 2667 2668 /* can't happen -- skb is a clone if info_id != 0 */ 2669 WARN_ON(info_id); 2670 2671 skb = skb_clone(skb, GFP_ATOMIC); 2672 kfree_skb(tmp_skb); 2673 2674 if (!skb) { 2675 ret = -ENOMEM; 2676 goto free; 2677 } 2678 } 2679 2680 hdr.frame_control = fc; 2681 hdr.duration_id = 0; 2682 hdr.seq_ctrl = 0; 2683 2684 skip_header_bytes = ETH_HLEN; 2685 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2686 encaps_data = bridge_tunnel_header; 2687 encaps_len = sizeof(bridge_tunnel_header); 2688 skip_header_bytes -= 2; 2689 } else if (ethertype >= ETH_P_802_3_MIN) { 2690 encaps_data = rfc1042_header; 2691 encaps_len = sizeof(rfc1042_header); 2692 skip_header_bytes -= 2; 2693 } else { 2694 encaps_data = NULL; 2695 encaps_len = 0; 2696 } 2697 2698 skb_pull(skb, skip_header_bytes); 2699 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2700 2701 /* 2702 * So we need to modify the skb header and hence need a copy of 2703 * that. The head_need variable above doesn't, so far, include 2704 * the needed header space that we don't need right away. If we 2705 * can, then we don't reallocate right now but only after the 2706 * frame arrives at the master device (if it does...) 2707 * 2708 * If we cannot, however, then we will reallocate to include all 2709 * the ever needed space. Also, if we need to reallocate it anyway, 2710 * make it big enough for everything we may ever need. 2711 */ 2712 2713 if (head_need > 0 || skb_cloned(skb)) { 2714 head_need += sdata->encrypt_headroom; 2715 head_need += local->tx_headroom; 2716 head_need = max_t(int, 0, head_need); 2717 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2718 ieee80211_free_txskb(&local->hw, skb); 2719 skb = NULL; 2720 return ERR_PTR(-ENOMEM); 2721 } 2722 } 2723 2724 if (encaps_data) 2725 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2726 2727 #ifdef CONFIG_MAC80211_MESH 2728 if (meshhdrlen > 0) 2729 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2730 #endif 2731 2732 if (ieee80211_is_data_qos(fc)) { 2733 __le16 *qos_control; 2734 2735 qos_control = skb_push(skb, 2); 2736 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2737 /* 2738 * Maybe we could actually set some fields here, for now just 2739 * initialise to zero to indicate no special operation. 2740 */ 2741 *qos_control = 0; 2742 } else 2743 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2744 2745 skb_reset_mac_header(skb); 2746 2747 info = IEEE80211_SKB_CB(skb); 2748 memset(info, 0, sizeof(*info)); 2749 2750 info->flags = info_flags; 2751 info->ack_frame_id = info_id; 2752 info->band = band; 2753 2754 return skb; 2755 free: 2756 kfree_skb(skb); 2757 return ERR_PTR(ret); 2758 } 2759 2760 /* 2761 * fast-xmit overview 2762 * 2763 * The core idea of this fast-xmit is to remove per-packet checks by checking 2764 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2765 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2766 * much less work can be done per packet. For example, fragmentation must be 2767 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2768 * in the code here. 2769 * 2770 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2771 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2772 * 2773 * The most difficult part of this is that when any of these assumptions 2774 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2775 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2776 * since the per-packet code no longer checks the conditions. This is reflected 2777 * by the calls to these functions throughout the rest of the code, and must be 2778 * maintained if any of the TX path checks change. 2779 */ 2780 2781 void ieee80211_check_fast_xmit(struct sta_info *sta) 2782 { 2783 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2784 struct ieee80211_local *local = sta->local; 2785 struct ieee80211_sub_if_data *sdata = sta->sdata; 2786 struct ieee80211_hdr *hdr = (void *)build.hdr; 2787 struct ieee80211_chanctx_conf *chanctx_conf; 2788 __le16 fc; 2789 2790 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2791 return; 2792 2793 /* Locking here protects both the pointer itself, and against concurrent 2794 * invocations winning data access races to, e.g., the key pointer that 2795 * is used. 2796 * Without it, the invocation of this function right after the key 2797 * pointer changes wouldn't be sufficient, as another CPU could access 2798 * the pointer, then stall, and then do the cache update after the CPU 2799 * that invalidated the key. 2800 * With the locking, such scenarios cannot happen as the check for the 2801 * key and the fast-tx assignment are done atomically, so the CPU that 2802 * modifies the key will either wait or other one will see the key 2803 * cleared/changed already. 2804 */ 2805 spin_lock_bh(&sta->lock); 2806 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2807 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2808 sdata->vif.type == NL80211_IFTYPE_STATION) 2809 goto out; 2810 2811 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2812 goto out; 2813 2814 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2815 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2816 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2817 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2818 goto out; 2819 2820 if (sdata->noack_map) 2821 goto out; 2822 2823 /* fast-xmit doesn't handle fragmentation at all */ 2824 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2825 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2826 goto out; 2827 2828 rcu_read_lock(); 2829 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2830 if (!chanctx_conf) { 2831 rcu_read_unlock(); 2832 goto out; 2833 } 2834 build.band = chanctx_conf->def.chan->band; 2835 rcu_read_unlock(); 2836 2837 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2838 2839 switch (sdata->vif.type) { 2840 case NL80211_IFTYPE_ADHOC: 2841 /* DA SA BSSID */ 2842 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2843 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2844 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2845 build.hdr_len = 24; 2846 break; 2847 case NL80211_IFTYPE_STATION: 2848 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2849 /* DA SA BSSID */ 2850 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2851 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2852 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2853 build.hdr_len = 24; 2854 break; 2855 } 2856 2857 if (sdata->u.mgd.use_4addr) { 2858 /* non-regular ethertype cannot use the fastpath */ 2859 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2860 IEEE80211_FCTL_TODS); 2861 /* RA TA DA SA */ 2862 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2863 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2864 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2865 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2866 build.hdr_len = 30; 2867 break; 2868 } 2869 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2870 /* BSSID SA DA */ 2871 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2872 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2873 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2874 build.hdr_len = 24; 2875 break; 2876 case NL80211_IFTYPE_AP_VLAN: 2877 if (sdata->wdev.use_4addr) { 2878 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2879 IEEE80211_FCTL_TODS); 2880 /* RA TA DA SA */ 2881 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2882 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2883 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2884 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2885 build.hdr_len = 30; 2886 break; 2887 } 2888 /* fall through */ 2889 case NL80211_IFTYPE_AP: 2890 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2891 /* DA BSSID SA */ 2892 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2893 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2894 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2895 build.hdr_len = 24; 2896 break; 2897 default: 2898 /* not handled on fast-xmit */ 2899 goto out; 2900 } 2901 2902 if (sta->sta.wme) { 2903 build.hdr_len += 2; 2904 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2905 } 2906 2907 /* We store the key here so there's no point in using rcu_dereference() 2908 * but that's fine because the code that changes the pointers will call 2909 * this function after doing so. For a single CPU that would be enough, 2910 * for multiple see the comment above. 2911 */ 2912 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2913 if (!build.key) 2914 build.key = rcu_access_pointer(sdata->default_unicast_key); 2915 if (build.key) { 2916 bool gen_iv, iv_spc, mmic; 2917 2918 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2919 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2920 mmic = build.key->conf.flags & 2921 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 2922 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 2923 2924 /* don't handle software crypto */ 2925 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2926 goto out; 2927 2928 switch (build.key->conf.cipher) { 2929 case WLAN_CIPHER_SUITE_CCMP: 2930 case WLAN_CIPHER_SUITE_CCMP_256: 2931 /* add fixed key ID */ 2932 if (gen_iv) { 2933 (build.hdr + build.hdr_len)[3] = 2934 0x20 | (build.key->conf.keyidx << 6); 2935 build.pn_offs = build.hdr_len; 2936 } 2937 if (gen_iv || iv_spc) 2938 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2939 break; 2940 case WLAN_CIPHER_SUITE_GCMP: 2941 case WLAN_CIPHER_SUITE_GCMP_256: 2942 /* add fixed key ID */ 2943 if (gen_iv) { 2944 (build.hdr + build.hdr_len)[3] = 2945 0x20 | (build.key->conf.keyidx << 6); 2946 build.pn_offs = build.hdr_len; 2947 } 2948 if (gen_iv || iv_spc) 2949 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2950 break; 2951 case WLAN_CIPHER_SUITE_TKIP: 2952 /* cannot handle MMIC or IV generation in xmit-fast */ 2953 if (mmic || gen_iv) 2954 goto out; 2955 if (iv_spc) 2956 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2957 break; 2958 case WLAN_CIPHER_SUITE_WEP40: 2959 case WLAN_CIPHER_SUITE_WEP104: 2960 /* cannot handle IV generation in fast-xmit */ 2961 if (gen_iv) 2962 goto out; 2963 if (iv_spc) 2964 build.hdr_len += IEEE80211_WEP_IV_LEN; 2965 break; 2966 case WLAN_CIPHER_SUITE_AES_CMAC: 2967 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2968 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2969 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2970 WARN(1, 2971 "management cipher suite 0x%x enabled for data\n", 2972 build.key->conf.cipher); 2973 goto out; 2974 default: 2975 /* we don't know how to generate IVs for this at all */ 2976 if (WARN_ON(gen_iv)) 2977 goto out; 2978 /* pure hardware keys are OK, of course */ 2979 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 2980 break; 2981 /* cipher scheme might require space allocation */ 2982 if (iv_spc && 2983 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 2984 goto out; 2985 if (iv_spc) 2986 build.hdr_len += build.key->conf.iv_len; 2987 } 2988 2989 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 2990 } 2991 2992 hdr->frame_control = fc; 2993 2994 memcpy(build.hdr + build.hdr_len, 2995 rfc1042_header, sizeof(rfc1042_header)); 2996 build.hdr_len += sizeof(rfc1042_header); 2997 2998 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 2999 /* if the kmemdup fails, continue w/o fast_tx */ 3000 if (!fast_tx) 3001 goto out; 3002 3003 out: 3004 /* we might have raced against another call to this function */ 3005 old = rcu_dereference_protected(sta->fast_tx, 3006 lockdep_is_held(&sta->lock)); 3007 rcu_assign_pointer(sta->fast_tx, fast_tx); 3008 if (old) 3009 kfree_rcu(old, rcu_head); 3010 spin_unlock_bh(&sta->lock); 3011 } 3012 3013 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3014 { 3015 struct sta_info *sta; 3016 3017 rcu_read_lock(); 3018 list_for_each_entry_rcu(sta, &local->sta_list, list) 3019 ieee80211_check_fast_xmit(sta); 3020 rcu_read_unlock(); 3021 } 3022 3023 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3024 { 3025 struct ieee80211_local *local = sdata->local; 3026 struct sta_info *sta; 3027 3028 rcu_read_lock(); 3029 3030 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3031 if (sdata != sta->sdata && 3032 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3033 continue; 3034 ieee80211_check_fast_xmit(sta); 3035 } 3036 3037 rcu_read_unlock(); 3038 } 3039 3040 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3041 { 3042 struct ieee80211_fast_tx *fast_tx; 3043 3044 spin_lock_bh(&sta->lock); 3045 fast_tx = rcu_dereference_protected(sta->fast_tx, 3046 lockdep_is_held(&sta->lock)); 3047 RCU_INIT_POINTER(sta->fast_tx, NULL); 3048 spin_unlock_bh(&sta->lock); 3049 3050 if (fast_tx) 3051 kfree_rcu(fast_tx, rcu_head); 3052 } 3053 3054 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3055 struct sk_buff *skb, int headroom, 3056 int *subframe_len) 3057 { 3058 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3059 int padding = (4 - amsdu_len) & 3; 3060 3061 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3062 I802_DEBUG_INC(local->tx_expand_skb_head); 3063 3064 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3065 wiphy_debug(local->hw.wiphy, 3066 "failed to reallocate TX buffer\n"); 3067 return false; 3068 } 3069 } 3070 3071 if (padding) { 3072 *subframe_len += padding; 3073 skb_put_zero(skb, padding); 3074 } 3075 3076 return true; 3077 } 3078 3079 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3080 struct ieee80211_fast_tx *fast_tx, 3081 struct sk_buff *skb) 3082 { 3083 struct ieee80211_local *local = sdata->local; 3084 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3085 struct ieee80211_hdr *hdr; 3086 struct ethhdr *amsdu_hdr; 3087 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3088 int subframe_len = skb->len - hdr_len; 3089 void *data; 3090 u8 *qc, *h_80211_src, *h_80211_dst; 3091 const u8 *bssid; 3092 3093 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3094 return false; 3095 3096 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3097 return true; 3098 3099 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr), 3100 &subframe_len)) 3101 return false; 3102 3103 data = skb_push(skb, sizeof(*amsdu_hdr)); 3104 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3105 hdr = data; 3106 amsdu_hdr = data + hdr_len; 3107 /* h_80211_src/dst is addr* field within hdr */ 3108 h_80211_src = data + fast_tx->sa_offs; 3109 h_80211_dst = data + fast_tx->da_offs; 3110 3111 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3112 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3113 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3114 3115 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3116 * fields needs to be changed to BSSID for A-MSDU frames depending 3117 * on FromDS/ToDS values. 3118 */ 3119 switch (sdata->vif.type) { 3120 case NL80211_IFTYPE_STATION: 3121 bssid = sdata->u.mgd.bssid; 3122 break; 3123 case NL80211_IFTYPE_AP: 3124 case NL80211_IFTYPE_AP_VLAN: 3125 bssid = sdata->vif.addr; 3126 break; 3127 default: 3128 bssid = NULL; 3129 } 3130 3131 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3132 ether_addr_copy(h_80211_src, bssid); 3133 3134 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3135 ether_addr_copy(h_80211_dst, bssid); 3136 3137 qc = ieee80211_get_qos_ctl(hdr); 3138 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3139 3140 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3141 3142 return true; 3143 } 3144 3145 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3146 struct sta_info *sta, 3147 struct ieee80211_fast_tx *fast_tx, 3148 struct sk_buff *skb) 3149 { 3150 struct ieee80211_local *local = sdata->local; 3151 struct fq *fq = &local->fq; 3152 struct fq_tin *tin; 3153 struct fq_flow *flow; 3154 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3155 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3156 struct txq_info *txqi; 3157 struct sk_buff **frag_tail, *head; 3158 int subframe_len = skb->len - ETH_ALEN; 3159 u8 max_subframes = sta->sta.max_amsdu_subframes; 3160 int max_frags = local->hw.max_tx_fragments; 3161 int max_amsdu_len = sta->sta.max_amsdu_len; 3162 __be16 len; 3163 void *data; 3164 bool ret = false; 3165 unsigned int orig_len; 3166 int n = 1, nfrags; 3167 3168 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3169 return false; 3170 3171 if (!txq) 3172 return false; 3173 3174 txqi = to_txq_info(txq); 3175 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3176 return false; 3177 3178 if (sta->sta.max_rc_amsdu_len) 3179 max_amsdu_len = min_t(int, max_amsdu_len, 3180 sta->sta.max_rc_amsdu_len); 3181 3182 spin_lock_bh(&fq->lock); 3183 3184 /* TODO: Ideally aggregation should be done on dequeue to remain 3185 * responsive to environment changes. 3186 */ 3187 3188 tin = &txqi->tin; 3189 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3190 head = skb_peek_tail(&flow->queue); 3191 if (!head) 3192 goto out; 3193 3194 orig_len = head->len; 3195 3196 if (skb->len + head->len > max_amsdu_len) 3197 goto out; 3198 3199 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3200 goto out; 3201 3202 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3203 nfrags += 1 + skb_shinfo(head)->nr_frags; 3204 frag_tail = &skb_shinfo(head)->frag_list; 3205 while (*frag_tail) { 3206 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3207 frag_tail = &(*frag_tail)->next; 3208 n++; 3209 } 3210 3211 if (max_subframes && n > max_subframes) 3212 goto out; 3213 3214 if (max_frags && nfrags > max_frags) 3215 goto out; 3216 3217 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3218 &subframe_len)) 3219 goto out; 3220 3221 ret = true; 3222 data = skb_push(skb, ETH_ALEN + 2); 3223 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3224 3225 data += 2 * ETH_ALEN; 3226 len = cpu_to_be16(subframe_len); 3227 memcpy(data, &len, 2); 3228 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3229 3230 head->len += skb->len; 3231 head->data_len += skb->len; 3232 *frag_tail = skb; 3233 3234 flow->backlog += head->len - orig_len; 3235 tin->backlog_bytes += head->len - orig_len; 3236 3237 fq_recalc_backlog(fq, tin, flow); 3238 3239 out: 3240 spin_unlock_bh(&fq->lock); 3241 3242 return ret; 3243 } 3244 3245 /* 3246 * Can be called while the sta lock is held. Anything that can cause packets to 3247 * be generated will cause deadlock! 3248 */ 3249 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3250 struct sta_info *sta, u8 pn_offs, 3251 struct ieee80211_key *key, 3252 struct sk_buff *skb) 3253 { 3254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3255 struct ieee80211_hdr *hdr = (void *)skb->data; 3256 u8 tid = IEEE80211_NUM_TIDS; 3257 3258 if (key) 3259 info->control.hw_key = &key->conf; 3260 3261 ieee80211_tx_stats(skb->dev, skb->len); 3262 3263 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3264 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3265 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3266 } else { 3267 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3268 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3269 sdata->sequence_number += 0x10; 3270 } 3271 3272 if (skb_shinfo(skb)->gso_size) 3273 sta->tx_stats.msdu[tid] += 3274 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3275 else 3276 sta->tx_stats.msdu[tid]++; 3277 3278 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3279 3280 /* statistics normally done by ieee80211_tx_h_stats (but that 3281 * has to consider fragmentation, so is more complex) 3282 */ 3283 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3284 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3285 3286 if (pn_offs) { 3287 u64 pn; 3288 u8 *crypto_hdr = skb->data + pn_offs; 3289 3290 switch (key->conf.cipher) { 3291 case WLAN_CIPHER_SUITE_CCMP: 3292 case WLAN_CIPHER_SUITE_CCMP_256: 3293 case WLAN_CIPHER_SUITE_GCMP: 3294 case WLAN_CIPHER_SUITE_GCMP_256: 3295 pn = atomic64_inc_return(&key->conf.tx_pn); 3296 crypto_hdr[0] = pn; 3297 crypto_hdr[1] = pn >> 8; 3298 crypto_hdr[4] = pn >> 16; 3299 crypto_hdr[5] = pn >> 24; 3300 crypto_hdr[6] = pn >> 32; 3301 crypto_hdr[7] = pn >> 40; 3302 break; 3303 } 3304 } 3305 } 3306 3307 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3308 struct sta_info *sta, 3309 struct ieee80211_fast_tx *fast_tx, 3310 struct sk_buff *skb) 3311 { 3312 struct ieee80211_local *local = sdata->local; 3313 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3314 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3315 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3316 struct ethhdr eth; 3317 struct ieee80211_tx_info *info; 3318 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3319 struct ieee80211_tx_data tx; 3320 ieee80211_tx_result r; 3321 struct tid_ampdu_tx *tid_tx = NULL; 3322 u8 tid = IEEE80211_NUM_TIDS; 3323 3324 /* control port protocol needs a lot of special handling */ 3325 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3326 return false; 3327 3328 /* only RFC 1042 SNAP */ 3329 if (ethertype < ETH_P_802_3_MIN) 3330 return false; 3331 3332 /* don't handle TX status request here either */ 3333 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3334 return false; 3335 3336 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3337 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3338 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3339 if (tid_tx) { 3340 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3341 return false; 3342 if (tid_tx->timeout) 3343 tid_tx->last_tx = jiffies; 3344 } 3345 } 3346 3347 /* after this point (skb is modified) we cannot return false */ 3348 3349 if (skb_shared(skb)) { 3350 struct sk_buff *tmp_skb = skb; 3351 3352 skb = skb_clone(skb, GFP_ATOMIC); 3353 kfree_skb(tmp_skb); 3354 3355 if (!skb) 3356 return true; 3357 } 3358 3359 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3360 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3361 return true; 3362 3363 /* will not be crypto-handled beyond what we do here, so use false 3364 * as the may-encrypt argument for the resize to not account for 3365 * more room than we already have in 'extra_head' 3366 */ 3367 if (unlikely(ieee80211_skb_resize(sdata, skb, 3368 max_t(int, extra_head + hw_headroom - 3369 skb_headroom(skb), 0), 3370 false))) { 3371 kfree_skb(skb); 3372 return true; 3373 } 3374 3375 memcpy(ð, skb->data, ETH_HLEN - 2); 3376 hdr = skb_push(skb, extra_head); 3377 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3378 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3379 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3380 3381 info = IEEE80211_SKB_CB(skb); 3382 memset(info, 0, sizeof(*info)); 3383 info->band = fast_tx->band; 3384 info->control.vif = &sdata->vif; 3385 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3386 IEEE80211_TX_CTL_DONTFRAG | 3387 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3388 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3389 3390 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3391 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3392 *ieee80211_get_qos_ctl(hdr) = tid; 3393 } 3394 3395 __skb_queue_head_init(&tx.skbs); 3396 3397 tx.flags = IEEE80211_TX_UNICAST; 3398 tx.local = local; 3399 tx.sdata = sdata; 3400 tx.sta = sta; 3401 tx.key = fast_tx->key; 3402 3403 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3404 tx.skb = skb; 3405 r = ieee80211_tx_h_rate_ctrl(&tx); 3406 skb = tx.skb; 3407 tx.skb = NULL; 3408 3409 if (r != TX_CONTINUE) { 3410 if (r != TX_QUEUED) 3411 kfree_skb(skb); 3412 return true; 3413 } 3414 } 3415 3416 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3417 return true; 3418 3419 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3420 fast_tx->key, skb); 3421 3422 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3423 sdata = container_of(sdata->bss, 3424 struct ieee80211_sub_if_data, u.ap); 3425 3426 __skb_queue_tail(&tx.skbs, skb); 3427 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3428 return true; 3429 } 3430 3431 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3432 struct ieee80211_txq *txq) 3433 { 3434 struct ieee80211_local *local = hw_to_local(hw); 3435 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3436 struct ieee80211_hdr *hdr; 3437 struct sk_buff *skb = NULL; 3438 struct fq *fq = &local->fq; 3439 struct fq_tin *tin = &txqi->tin; 3440 struct ieee80211_tx_info *info; 3441 struct ieee80211_tx_data tx; 3442 ieee80211_tx_result r; 3443 struct ieee80211_vif *vif; 3444 3445 spin_lock_bh(&fq->lock); 3446 3447 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 3448 goto out; 3449 3450 /* Make sure fragments stay together. */ 3451 skb = __skb_dequeue(&txqi->frags); 3452 if (skb) 3453 goto out; 3454 3455 begin: 3456 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3457 if (!skb) 3458 goto out; 3459 3460 hdr = (struct ieee80211_hdr *)skb->data; 3461 info = IEEE80211_SKB_CB(skb); 3462 3463 memset(&tx, 0, sizeof(tx)); 3464 __skb_queue_head_init(&tx.skbs); 3465 tx.local = local; 3466 tx.skb = skb; 3467 tx.sdata = vif_to_sdata(info->control.vif); 3468 3469 if (txq->sta) 3470 tx.sta = container_of(txq->sta, struct sta_info, sta); 3471 3472 /* 3473 * The key can be removed while the packet was queued, so need to call 3474 * this here to get the current key. 3475 */ 3476 r = ieee80211_tx_h_select_key(&tx); 3477 if (r != TX_CONTINUE) { 3478 ieee80211_free_txskb(&local->hw, skb); 3479 goto begin; 3480 } 3481 3482 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3483 info->flags |= IEEE80211_TX_CTL_AMPDU; 3484 else 3485 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3486 3487 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3488 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3489 sta); 3490 u8 pn_offs = 0; 3491 3492 if (tx.key && 3493 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3494 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3495 3496 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3497 tx.key, skb); 3498 } else { 3499 if (invoke_tx_handlers_late(&tx)) 3500 goto begin; 3501 3502 skb = __skb_dequeue(&tx.skbs); 3503 3504 if (!skb_queue_empty(&tx.skbs)) 3505 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3506 } 3507 3508 if (skb && skb_has_frag_list(skb) && 3509 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3510 if (skb_linearize(skb)) { 3511 ieee80211_free_txskb(&local->hw, skb); 3512 goto begin; 3513 } 3514 } 3515 3516 switch (tx.sdata->vif.type) { 3517 case NL80211_IFTYPE_MONITOR: 3518 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3519 vif = &tx.sdata->vif; 3520 break; 3521 } 3522 tx.sdata = rcu_dereference(local->monitor_sdata); 3523 if (tx.sdata) { 3524 vif = &tx.sdata->vif; 3525 info->hw_queue = 3526 vif->hw_queue[skb_get_queue_mapping(skb)]; 3527 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3528 ieee80211_free_txskb(&local->hw, skb); 3529 goto begin; 3530 } else { 3531 vif = NULL; 3532 } 3533 break; 3534 case NL80211_IFTYPE_AP_VLAN: 3535 tx.sdata = container_of(tx.sdata->bss, 3536 struct ieee80211_sub_if_data, u.ap); 3537 /* fall through */ 3538 default: 3539 vif = &tx.sdata->vif; 3540 break; 3541 } 3542 3543 IEEE80211_SKB_CB(skb)->control.vif = vif; 3544 out: 3545 spin_unlock_bh(&fq->lock); 3546 3547 return skb; 3548 } 3549 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3550 3551 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3552 struct net_device *dev, 3553 u32 info_flags) 3554 { 3555 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3556 struct sta_info *sta; 3557 struct sk_buff *next; 3558 3559 if (unlikely(skb->len < ETH_HLEN)) { 3560 kfree_skb(skb); 3561 return; 3562 } 3563 3564 rcu_read_lock(); 3565 3566 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3567 goto out_free; 3568 3569 if (!IS_ERR_OR_NULL(sta)) { 3570 struct ieee80211_fast_tx *fast_tx; 3571 3572 fast_tx = rcu_dereference(sta->fast_tx); 3573 3574 if (fast_tx && 3575 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3576 goto out; 3577 } 3578 3579 if (skb_is_gso(skb)) { 3580 struct sk_buff *segs; 3581 3582 segs = skb_gso_segment(skb, 0); 3583 if (IS_ERR(segs)) { 3584 goto out_free; 3585 } else if (segs) { 3586 consume_skb(skb); 3587 skb = segs; 3588 } 3589 } else { 3590 /* we cannot process non-linear frames on this path */ 3591 if (skb_linearize(skb)) { 3592 kfree_skb(skb); 3593 goto out; 3594 } 3595 3596 /* the frame could be fragmented, software-encrypted, and other 3597 * things so we cannot really handle checksum offload with it - 3598 * fix it up in software before we handle anything else. 3599 */ 3600 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3601 skb_set_transport_header(skb, 3602 skb_checksum_start_offset(skb)); 3603 if (skb_checksum_help(skb)) 3604 goto out_free; 3605 } 3606 } 3607 3608 next = skb; 3609 while (next) { 3610 skb = next; 3611 next = skb->next; 3612 3613 skb->prev = NULL; 3614 skb->next = NULL; 3615 3616 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3617 if (IS_ERR(skb)) 3618 goto out; 3619 3620 ieee80211_tx_stats(dev, skb->len); 3621 3622 ieee80211_xmit(sdata, sta, skb); 3623 } 3624 goto out; 3625 out_free: 3626 kfree_skb(skb); 3627 out: 3628 rcu_read_unlock(); 3629 } 3630 3631 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3632 { 3633 struct ethhdr *eth; 3634 int err; 3635 3636 err = skb_ensure_writable(skb, ETH_HLEN); 3637 if (unlikely(err)) 3638 return err; 3639 3640 eth = (void *)skb->data; 3641 ether_addr_copy(eth->h_dest, sta->sta.addr); 3642 3643 return 0; 3644 } 3645 3646 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3647 struct net_device *dev) 3648 { 3649 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3650 const struct ethhdr *eth = (void *)skb->data; 3651 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3652 __be16 ethertype; 3653 3654 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3655 return false; 3656 3657 switch (sdata->vif.type) { 3658 case NL80211_IFTYPE_AP_VLAN: 3659 if (sdata->u.vlan.sta) 3660 return false; 3661 if (sdata->wdev.use_4addr) 3662 return false; 3663 /* fall through */ 3664 case NL80211_IFTYPE_AP: 3665 /* check runtime toggle for this bss */ 3666 if (!sdata->bss->multicast_to_unicast) 3667 return false; 3668 break; 3669 default: 3670 return false; 3671 } 3672 3673 /* multicast to unicast conversion only for some payload */ 3674 ethertype = eth->h_proto; 3675 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3676 ethertype = ethvlan->h_vlan_encapsulated_proto; 3677 switch (ethertype) { 3678 case htons(ETH_P_ARP): 3679 case htons(ETH_P_IP): 3680 case htons(ETH_P_IPV6): 3681 break; 3682 default: 3683 return false; 3684 } 3685 3686 return true; 3687 } 3688 3689 static void 3690 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3691 struct sk_buff_head *queue) 3692 { 3693 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3694 struct ieee80211_local *local = sdata->local; 3695 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3696 struct sta_info *sta, *first = NULL; 3697 struct sk_buff *cloned_skb; 3698 3699 rcu_read_lock(); 3700 3701 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3702 if (sdata != sta->sdata) 3703 /* AP-VLAN mismatch */ 3704 continue; 3705 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3706 /* do not send back to source */ 3707 continue; 3708 if (!first) { 3709 first = sta; 3710 continue; 3711 } 3712 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3713 if (!cloned_skb) 3714 goto multicast; 3715 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3716 dev_kfree_skb(cloned_skb); 3717 goto multicast; 3718 } 3719 __skb_queue_tail(queue, cloned_skb); 3720 } 3721 3722 if (likely(first)) { 3723 if (unlikely(ieee80211_change_da(skb, first))) 3724 goto multicast; 3725 __skb_queue_tail(queue, skb); 3726 } else { 3727 /* no STA connected, drop */ 3728 kfree_skb(skb); 3729 skb = NULL; 3730 } 3731 3732 goto out; 3733 multicast: 3734 __skb_queue_purge(queue); 3735 __skb_queue_tail(queue, skb); 3736 out: 3737 rcu_read_unlock(); 3738 } 3739 3740 /** 3741 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3742 * @skb: packet to be sent 3743 * @dev: incoming interface 3744 * 3745 * On failure skb will be freed. 3746 */ 3747 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3748 struct net_device *dev) 3749 { 3750 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 3751 struct sk_buff_head queue; 3752 3753 __skb_queue_head_init(&queue); 3754 ieee80211_convert_to_unicast(skb, dev, &queue); 3755 while ((skb = __skb_dequeue(&queue))) 3756 __ieee80211_subif_start_xmit(skb, dev, 0); 3757 } else { 3758 __ieee80211_subif_start_xmit(skb, dev, 0); 3759 } 3760 3761 return NETDEV_TX_OK; 3762 } 3763 3764 struct sk_buff * 3765 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3766 struct sk_buff *skb, u32 info_flags) 3767 { 3768 struct ieee80211_hdr *hdr; 3769 struct ieee80211_tx_data tx = { 3770 .local = sdata->local, 3771 .sdata = sdata, 3772 }; 3773 struct sta_info *sta; 3774 3775 rcu_read_lock(); 3776 3777 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3778 kfree_skb(skb); 3779 skb = ERR_PTR(-EINVAL); 3780 goto out; 3781 } 3782 3783 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3784 if (IS_ERR(skb)) 3785 goto out; 3786 3787 hdr = (void *)skb->data; 3788 tx.sta = sta_info_get(sdata, hdr->addr1); 3789 tx.skb = skb; 3790 3791 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3792 rcu_read_unlock(); 3793 kfree_skb(skb); 3794 return ERR_PTR(-EINVAL); 3795 } 3796 3797 out: 3798 rcu_read_unlock(); 3799 return skb; 3800 } 3801 3802 /* 3803 * ieee80211_clear_tx_pending may not be called in a context where 3804 * it is possible that it packets could come in again. 3805 */ 3806 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3807 { 3808 struct sk_buff *skb; 3809 int i; 3810 3811 for (i = 0; i < local->hw.queues; i++) { 3812 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3813 ieee80211_free_txskb(&local->hw, skb); 3814 } 3815 } 3816 3817 /* 3818 * Returns false if the frame couldn't be transmitted but was queued instead, 3819 * which in this case means re-queued -- take as an indication to stop sending 3820 * more pending frames. 3821 */ 3822 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3823 struct sk_buff *skb) 3824 { 3825 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3826 struct ieee80211_sub_if_data *sdata; 3827 struct sta_info *sta; 3828 struct ieee80211_hdr *hdr; 3829 bool result; 3830 struct ieee80211_chanctx_conf *chanctx_conf; 3831 3832 sdata = vif_to_sdata(info->control.vif); 3833 3834 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3835 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3836 if (unlikely(!chanctx_conf)) { 3837 dev_kfree_skb(skb); 3838 return true; 3839 } 3840 info->band = chanctx_conf->def.chan->band; 3841 result = ieee80211_tx(sdata, NULL, skb, true); 3842 } else { 3843 struct sk_buff_head skbs; 3844 3845 __skb_queue_head_init(&skbs); 3846 __skb_queue_tail(&skbs, skb); 3847 3848 hdr = (struct ieee80211_hdr *)skb->data; 3849 sta = sta_info_get(sdata, hdr->addr1); 3850 3851 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3852 } 3853 3854 return result; 3855 } 3856 3857 /* 3858 * Transmit all pending packets. Called from tasklet. 3859 */ 3860 void ieee80211_tx_pending(unsigned long data) 3861 { 3862 struct ieee80211_local *local = (struct ieee80211_local *)data; 3863 unsigned long flags; 3864 int i; 3865 bool txok; 3866 3867 rcu_read_lock(); 3868 3869 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3870 for (i = 0; i < local->hw.queues; i++) { 3871 /* 3872 * If queue is stopped by something other than due to pending 3873 * frames, or we have no pending frames, proceed to next queue. 3874 */ 3875 if (local->queue_stop_reasons[i] || 3876 skb_queue_empty(&local->pending[i])) 3877 continue; 3878 3879 while (!skb_queue_empty(&local->pending[i])) { 3880 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3881 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3882 3883 if (WARN_ON(!info->control.vif)) { 3884 ieee80211_free_txskb(&local->hw, skb); 3885 continue; 3886 } 3887 3888 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3889 flags); 3890 3891 txok = ieee80211_tx_pending_skb(local, skb); 3892 spin_lock_irqsave(&local->queue_stop_reason_lock, 3893 flags); 3894 if (!txok) 3895 break; 3896 } 3897 3898 if (skb_queue_empty(&local->pending[i])) 3899 ieee80211_propagate_queue_wake(local, i); 3900 } 3901 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3902 3903 rcu_read_unlock(); 3904 } 3905 3906 /* functions for drivers to get certain frames */ 3907 3908 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3909 struct ps_data *ps, struct sk_buff *skb, 3910 bool is_template) 3911 { 3912 u8 *pos, *tim; 3913 int aid0 = 0; 3914 int i, have_bits = 0, n1, n2; 3915 3916 /* Generate bitmap for TIM only if there are any STAs in power save 3917 * mode. */ 3918 if (atomic_read(&ps->num_sta_ps) > 0) 3919 /* in the hope that this is faster than 3920 * checking byte-for-byte */ 3921 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3922 IEEE80211_MAX_AID+1); 3923 if (!is_template) { 3924 if (ps->dtim_count == 0) 3925 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3926 else 3927 ps->dtim_count--; 3928 } 3929 3930 tim = pos = skb_put(skb, 6); 3931 *pos++ = WLAN_EID_TIM; 3932 *pos++ = 4; 3933 *pos++ = ps->dtim_count; 3934 *pos++ = sdata->vif.bss_conf.dtim_period; 3935 3936 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3937 aid0 = 1; 3938 3939 ps->dtim_bc_mc = aid0 == 1; 3940 3941 if (have_bits) { 3942 /* Find largest even number N1 so that bits numbered 1 through 3943 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3944 * (N2 + 1) x 8 through 2007 are 0. */ 3945 n1 = 0; 3946 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3947 if (ps->tim[i]) { 3948 n1 = i & 0xfe; 3949 break; 3950 } 3951 } 3952 n2 = n1; 3953 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3954 if (ps->tim[i]) { 3955 n2 = i; 3956 break; 3957 } 3958 } 3959 3960 /* Bitmap control */ 3961 *pos++ = n1 | aid0; 3962 /* Part Virt Bitmap */ 3963 skb_put(skb, n2 - n1); 3964 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3965 3966 tim[1] = n2 - n1 + 4; 3967 } else { 3968 *pos++ = aid0; /* Bitmap control */ 3969 *pos++ = 0; /* Part Virt Bitmap */ 3970 } 3971 } 3972 3973 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3974 struct ps_data *ps, struct sk_buff *skb, 3975 bool is_template) 3976 { 3977 struct ieee80211_local *local = sdata->local; 3978 3979 /* 3980 * Not very nice, but we want to allow the driver to call 3981 * ieee80211_beacon_get() as a response to the set_tim() 3982 * callback. That, however, is already invoked under the 3983 * sta_lock to guarantee consistent and race-free update 3984 * of the tim bitmap in mac80211 and the driver. 3985 */ 3986 if (local->tim_in_locked_section) { 3987 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3988 } else { 3989 spin_lock_bh(&local->tim_lock); 3990 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 3991 spin_unlock_bh(&local->tim_lock); 3992 } 3993 3994 return 0; 3995 } 3996 3997 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 3998 struct beacon_data *beacon) 3999 { 4000 struct probe_resp *resp; 4001 u8 *beacon_data; 4002 size_t beacon_data_len; 4003 int i; 4004 u8 count = beacon->csa_current_counter; 4005 4006 switch (sdata->vif.type) { 4007 case NL80211_IFTYPE_AP: 4008 beacon_data = beacon->tail; 4009 beacon_data_len = beacon->tail_len; 4010 break; 4011 case NL80211_IFTYPE_ADHOC: 4012 beacon_data = beacon->head; 4013 beacon_data_len = beacon->head_len; 4014 break; 4015 case NL80211_IFTYPE_MESH_POINT: 4016 beacon_data = beacon->head; 4017 beacon_data_len = beacon->head_len; 4018 break; 4019 default: 4020 return; 4021 } 4022 4023 rcu_read_lock(); 4024 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4025 resp = rcu_dereference(sdata->u.ap.probe_resp); 4026 4027 if (beacon->csa_counter_offsets[i]) { 4028 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4029 beacon_data_len)) { 4030 rcu_read_unlock(); 4031 return; 4032 } 4033 4034 beacon_data[beacon->csa_counter_offsets[i]] = count; 4035 } 4036 4037 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4038 resp->data[resp->csa_counter_offsets[i]] = count; 4039 } 4040 rcu_read_unlock(); 4041 } 4042 4043 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4044 { 4045 beacon->csa_current_counter--; 4046 4047 /* the counter should never reach 0 */ 4048 WARN_ON_ONCE(!beacon->csa_current_counter); 4049 4050 return beacon->csa_current_counter; 4051 } 4052 4053 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4054 { 4055 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4056 struct beacon_data *beacon = NULL; 4057 u8 count = 0; 4058 4059 rcu_read_lock(); 4060 4061 if (sdata->vif.type == NL80211_IFTYPE_AP) 4062 beacon = rcu_dereference(sdata->u.ap.beacon); 4063 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4064 beacon = rcu_dereference(sdata->u.ibss.presp); 4065 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4066 beacon = rcu_dereference(sdata->u.mesh.beacon); 4067 4068 if (!beacon) 4069 goto unlock; 4070 4071 count = __ieee80211_csa_update_counter(beacon); 4072 4073 unlock: 4074 rcu_read_unlock(); 4075 return count; 4076 } 4077 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4078 4079 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4080 { 4081 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4082 struct beacon_data *beacon = NULL; 4083 u8 *beacon_data; 4084 size_t beacon_data_len; 4085 int ret = false; 4086 4087 if (!ieee80211_sdata_running(sdata)) 4088 return false; 4089 4090 rcu_read_lock(); 4091 if (vif->type == NL80211_IFTYPE_AP) { 4092 struct ieee80211_if_ap *ap = &sdata->u.ap; 4093 4094 beacon = rcu_dereference(ap->beacon); 4095 if (WARN_ON(!beacon || !beacon->tail)) 4096 goto out; 4097 beacon_data = beacon->tail; 4098 beacon_data_len = beacon->tail_len; 4099 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4100 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4101 4102 beacon = rcu_dereference(ifibss->presp); 4103 if (!beacon) 4104 goto out; 4105 4106 beacon_data = beacon->head; 4107 beacon_data_len = beacon->head_len; 4108 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4109 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4110 4111 beacon = rcu_dereference(ifmsh->beacon); 4112 if (!beacon) 4113 goto out; 4114 4115 beacon_data = beacon->head; 4116 beacon_data_len = beacon->head_len; 4117 } else { 4118 WARN_ON(1); 4119 goto out; 4120 } 4121 4122 if (!beacon->csa_counter_offsets[0]) 4123 goto out; 4124 4125 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4126 goto out; 4127 4128 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4129 ret = true; 4130 out: 4131 rcu_read_unlock(); 4132 4133 return ret; 4134 } 4135 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4136 4137 static struct sk_buff * 4138 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4139 struct ieee80211_vif *vif, 4140 struct ieee80211_mutable_offsets *offs, 4141 bool is_template) 4142 { 4143 struct ieee80211_local *local = hw_to_local(hw); 4144 struct beacon_data *beacon = NULL; 4145 struct sk_buff *skb = NULL; 4146 struct ieee80211_tx_info *info; 4147 struct ieee80211_sub_if_data *sdata = NULL; 4148 enum nl80211_band band; 4149 struct ieee80211_tx_rate_control txrc; 4150 struct ieee80211_chanctx_conf *chanctx_conf; 4151 int csa_off_base = 0; 4152 4153 rcu_read_lock(); 4154 4155 sdata = vif_to_sdata(vif); 4156 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4157 4158 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4159 goto out; 4160 4161 if (offs) 4162 memset(offs, 0, sizeof(*offs)); 4163 4164 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4165 struct ieee80211_if_ap *ap = &sdata->u.ap; 4166 4167 beacon = rcu_dereference(ap->beacon); 4168 if (beacon) { 4169 if (beacon->csa_counter_offsets[0]) { 4170 if (!is_template) 4171 __ieee80211_csa_update_counter(beacon); 4172 4173 ieee80211_set_csa(sdata, beacon); 4174 } 4175 4176 /* 4177 * headroom, head length, 4178 * tail length and maximum TIM length 4179 */ 4180 skb = dev_alloc_skb(local->tx_headroom + 4181 beacon->head_len + 4182 beacon->tail_len + 256 + 4183 local->hw.extra_beacon_tailroom); 4184 if (!skb) 4185 goto out; 4186 4187 skb_reserve(skb, local->tx_headroom); 4188 skb_put_data(skb, beacon->head, beacon->head_len); 4189 4190 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4191 is_template); 4192 4193 if (offs) { 4194 offs->tim_offset = beacon->head_len; 4195 offs->tim_length = skb->len - beacon->head_len; 4196 4197 /* for AP the csa offsets are from tail */ 4198 csa_off_base = skb->len; 4199 } 4200 4201 if (beacon->tail) 4202 skb_put_data(skb, beacon->tail, 4203 beacon->tail_len); 4204 } else 4205 goto out; 4206 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4207 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4208 struct ieee80211_hdr *hdr; 4209 4210 beacon = rcu_dereference(ifibss->presp); 4211 if (!beacon) 4212 goto out; 4213 4214 if (beacon->csa_counter_offsets[0]) { 4215 if (!is_template) 4216 __ieee80211_csa_update_counter(beacon); 4217 4218 ieee80211_set_csa(sdata, beacon); 4219 } 4220 4221 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4222 local->hw.extra_beacon_tailroom); 4223 if (!skb) 4224 goto out; 4225 skb_reserve(skb, local->tx_headroom); 4226 skb_put_data(skb, beacon->head, beacon->head_len); 4227 4228 hdr = (struct ieee80211_hdr *) skb->data; 4229 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4230 IEEE80211_STYPE_BEACON); 4231 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4232 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4233 4234 beacon = rcu_dereference(ifmsh->beacon); 4235 if (!beacon) 4236 goto out; 4237 4238 if (beacon->csa_counter_offsets[0]) { 4239 if (!is_template) 4240 /* TODO: For mesh csa_counter is in TU, so 4241 * decrementing it by one isn't correct, but 4242 * for now we leave it consistent with overall 4243 * mac80211's behavior. 4244 */ 4245 __ieee80211_csa_update_counter(beacon); 4246 4247 ieee80211_set_csa(sdata, beacon); 4248 } 4249 4250 if (ifmsh->sync_ops) 4251 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4252 4253 skb = dev_alloc_skb(local->tx_headroom + 4254 beacon->head_len + 4255 256 + /* TIM IE */ 4256 beacon->tail_len + 4257 local->hw.extra_beacon_tailroom); 4258 if (!skb) 4259 goto out; 4260 skb_reserve(skb, local->tx_headroom); 4261 skb_put_data(skb, beacon->head, beacon->head_len); 4262 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4263 4264 if (offs) { 4265 offs->tim_offset = beacon->head_len; 4266 offs->tim_length = skb->len - beacon->head_len; 4267 } 4268 4269 skb_put_data(skb, beacon->tail, beacon->tail_len); 4270 } else { 4271 WARN_ON(1); 4272 goto out; 4273 } 4274 4275 /* CSA offsets */ 4276 if (offs && beacon) { 4277 int i; 4278 4279 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4280 u16 csa_off = beacon->csa_counter_offsets[i]; 4281 4282 if (!csa_off) 4283 continue; 4284 4285 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4286 } 4287 } 4288 4289 band = chanctx_conf->def.chan->band; 4290 4291 info = IEEE80211_SKB_CB(skb); 4292 4293 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4294 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4295 info->band = band; 4296 4297 memset(&txrc, 0, sizeof(txrc)); 4298 txrc.hw = hw; 4299 txrc.sband = local->hw.wiphy->bands[band]; 4300 txrc.bss_conf = &sdata->vif.bss_conf; 4301 txrc.skb = skb; 4302 txrc.reported_rate.idx = -1; 4303 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4304 txrc.bss = true; 4305 rate_control_get_rate(sdata, NULL, &txrc); 4306 4307 info->control.vif = vif; 4308 4309 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4310 IEEE80211_TX_CTL_ASSIGN_SEQ | 4311 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4312 out: 4313 rcu_read_unlock(); 4314 return skb; 4315 4316 } 4317 4318 struct sk_buff * 4319 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4320 struct ieee80211_vif *vif, 4321 struct ieee80211_mutable_offsets *offs) 4322 { 4323 return __ieee80211_beacon_get(hw, vif, offs, true); 4324 } 4325 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4326 4327 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4328 struct ieee80211_vif *vif, 4329 u16 *tim_offset, u16 *tim_length) 4330 { 4331 struct ieee80211_mutable_offsets offs = {}; 4332 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4333 struct sk_buff *copy; 4334 struct ieee80211_supported_band *sband; 4335 int shift; 4336 4337 if (!bcn) 4338 return bcn; 4339 4340 if (tim_offset) 4341 *tim_offset = offs.tim_offset; 4342 4343 if (tim_length) 4344 *tim_length = offs.tim_length; 4345 4346 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4347 !hw_to_local(hw)->monitors) 4348 return bcn; 4349 4350 /* send a copy to monitor interfaces */ 4351 copy = skb_copy(bcn, GFP_ATOMIC); 4352 if (!copy) 4353 return bcn; 4354 4355 shift = ieee80211_vif_get_shift(vif); 4356 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4357 if (!sband) 4358 return bcn; 4359 4360 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4361 4362 return bcn; 4363 } 4364 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4365 4366 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4367 struct ieee80211_vif *vif) 4368 { 4369 struct ieee80211_if_ap *ap = NULL; 4370 struct sk_buff *skb = NULL; 4371 struct probe_resp *presp = NULL; 4372 struct ieee80211_hdr *hdr; 4373 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4374 4375 if (sdata->vif.type != NL80211_IFTYPE_AP) 4376 return NULL; 4377 4378 rcu_read_lock(); 4379 4380 ap = &sdata->u.ap; 4381 presp = rcu_dereference(ap->probe_resp); 4382 if (!presp) 4383 goto out; 4384 4385 skb = dev_alloc_skb(presp->len); 4386 if (!skb) 4387 goto out; 4388 4389 skb_put_data(skb, presp->data, presp->len); 4390 4391 hdr = (struct ieee80211_hdr *) skb->data; 4392 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4393 4394 out: 4395 rcu_read_unlock(); 4396 return skb; 4397 } 4398 EXPORT_SYMBOL(ieee80211_proberesp_get); 4399 4400 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4401 struct ieee80211_vif *vif) 4402 { 4403 struct ieee80211_sub_if_data *sdata; 4404 struct ieee80211_if_managed *ifmgd; 4405 struct ieee80211_pspoll *pspoll; 4406 struct ieee80211_local *local; 4407 struct sk_buff *skb; 4408 4409 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4410 return NULL; 4411 4412 sdata = vif_to_sdata(vif); 4413 ifmgd = &sdata->u.mgd; 4414 local = sdata->local; 4415 4416 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4417 if (!skb) 4418 return NULL; 4419 4420 skb_reserve(skb, local->hw.extra_tx_headroom); 4421 4422 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4423 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4424 IEEE80211_STYPE_PSPOLL); 4425 pspoll->aid = cpu_to_le16(ifmgd->aid); 4426 4427 /* aid in PS-Poll has its two MSBs each set to 1 */ 4428 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4429 4430 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4431 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4432 4433 return skb; 4434 } 4435 EXPORT_SYMBOL(ieee80211_pspoll_get); 4436 4437 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4438 struct ieee80211_vif *vif, 4439 bool qos_ok) 4440 { 4441 struct ieee80211_hdr_3addr *nullfunc; 4442 struct ieee80211_sub_if_data *sdata; 4443 struct ieee80211_if_managed *ifmgd; 4444 struct ieee80211_local *local; 4445 struct sk_buff *skb; 4446 bool qos = false; 4447 4448 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4449 return NULL; 4450 4451 sdata = vif_to_sdata(vif); 4452 ifmgd = &sdata->u.mgd; 4453 local = sdata->local; 4454 4455 if (qos_ok) { 4456 struct sta_info *sta; 4457 4458 rcu_read_lock(); 4459 sta = sta_info_get(sdata, ifmgd->bssid); 4460 qos = sta && sta->sta.wme; 4461 rcu_read_unlock(); 4462 } 4463 4464 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4465 sizeof(*nullfunc) + 2); 4466 if (!skb) 4467 return NULL; 4468 4469 skb_reserve(skb, local->hw.extra_tx_headroom); 4470 4471 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4472 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4473 IEEE80211_STYPE_NULLFUNC | 4474 IEEE80211_FCTL_TODS); 4475 if (qos) { 4476 __le16 qos = cpu_to_le16(7); 4477 4478 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 4479 IEEE80211_STYPE_NULLFUNC) != 4480 IEEE80211_STYPE_QOS_NULLFUNC); 4481 nullfunc->frame_control |= 4482 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 4483 skb->priority = 7; 4484 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 4485 skb_put_data(skb, &qos, sizeof(qos)); 4486 } 4487 4488 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4489 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4490 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4491 4492 return skb; 4493 } 4494 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4495 4496 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4497 const u8 *src_addr, 4498 const u8 *ssid, size_t ssid_len, 4499 size_t tailroom) 4500 { 4501 struct ieee80211_local *local = hw_to_local(hw); 4502 struct ieee80211_hdr_3addr *hdr; 4503 struct sk_buff *skb; 4504 size_t ie_ssid_len; 4505 u8 *pos; 4506 4507 ie_ssid_len = 2 + ssid_len; 4508 4509 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4510 ie_ssid_len + tailroom); 4511 if (!skb) 4512 return NULL; 4513 4514 skb_reserve(skb, local->hw.extra_tx_headroom); 4515 4516 hdr = skb_put_zero(skb, sizeof(*hdr)); 4517 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4518 IEEE80211_STYPE_PROBE_REQ); 4519 eth_broadcast_addr(hdr->addr1); 4520 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4521 eth_broadcast_addr(hdr->addr3); 4522 4523 pos = skb_put(skb, ie_ssid_len); 4524 *pos++ = WLAN_EID_SSID; 4525 *pos++ = ssid_len; 4526 if (ssid_len) 4527 memcpy(pos, ssid, ssid_len); 4528 pos += ssid_len; 4529 4530 return skb; 4531 } 4532 EXPORT_SYMBOL(ieee80211_probereq_get); 4533 4534 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4535 const void *frame, size_t frame_len, 4536 const struct ieee80211_tx_info *frame_txctl, 4537 struct ieee80211_rts *rts) 4538 { 4539 const struct ieee80211_hdr *hdr = frame; 4540 4541 rts->frame_control = 4542 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4543 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4544 frame_txctl); 4545 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4546 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4547 } 4548 EXPORT_SYMBOL(ieee80211_rts_get); 4549 4550 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4551 const void *frame, size_t frame_len, 4552 const struct ieee80211_tx_info *frame_txctl, 4553 struct ieee80211_cts *cts) 4554 { 4555 const struct ieee80211_hdr *hdr = frame; 4556 4557 cts->frame_control = 4558 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4559 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4560 frame_len, frame_txctl); 4561 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4562 } 4563 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4564 4565 struct sk_buff * 4566 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4567 struct ieee80211_vif *vif) 4568 { 4569 struct ieee80211_local *local = hw_to_local(hw); 4570 struct sk_buff *skb = NULL; 4571 struct ieee80211_tx_data tx; 4572 struct ieee80211_sub_if_data *sdata; 4573 struct ps_data *ps; 4574 struct ieee80211_tx_info *info; 4575 struct ieee80211_chanctx_conf *chanctx_conf; 4576 4577 sdata = vif_to_sdata(vif); 4578 4579 rcu_read_lock(); 4580 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4581 4582 if (!chanctx_conf) 4583 goto out; 4584 4585 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4586 struct beacon_data *beacon = 4587 rcu_dereference(sdata->u.ap.beacon); 4588 4589 if (!beacon || !beacon->head) 4590 goto out; 4591 4592 ps = &sdata->u.ap.ps; 4593 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4594 ps = &sdata->u.mesh.ps; 4595 } else { 4596 goto out; 4597 } 4598 4599 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4600 goto out; /* send buffered bc/mc only after DTIM beacon */ 4601 4602 while (1) { 4603 skb = skb_dequeue(&ps->bc_buf); 4604 if (!skb) 4605 goto out; 4606 local->total_ps_buffered--; 4607 4608 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4609 struct ieee80211_hdr *hdr = 4610 (struct ieee80211_hdr *) skb->data; 4611 /* more buffered multicast/broadcast frames ==> set 4612 * MoreData flag in IEEE 802.11 header to inform PS 4613 * STAs */ 4614 hdr->frame_control |= 4615 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4616 } 4617 4618 if (sdata->vif.type == NL80211_IFTYPE_AP) 4619 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4620 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4621 break; 4622 ieee80211_free_txskb(hw, skb); 4623 } 4624 4625 info = IEEE80211_SKB_CB(skb); 4626 4627 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4628 info->band = chanctx_conf->def.chan->band; 4629 4630 if (invoke_tx_handlers(&tx)) 4631 skb = NULL; 4632 out: 4633 rcu_read_unlock(); 4634 4635 return skb; 4636 } 4637 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4638 4639 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4640 { 4641 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4642 struct ieee80211_sub_if_data *sdata = sta->sdata; 4643 struct ieee80211_local *local = sdata->local; 4644 int ret; 4645 u32 queues; 4646 4647 lockdep_assert_held(&local->sta_mtx); 4648 4649 /* only some cases are supported right now */ 4650 switch (sdata->vif.type) { 4651 case NL80211_IFTYPE_STATION: 4652 case NL80211_IFTYPE_AP: 4653 case NL80211_IFTYPE_AP_VLAN: 4654 break; 4655 default: 4656 WARN_ON(1); 4657 return -EINVAL; 4658 } 4659 4660 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4661 return -EINVAL; 4662 4663 if (sta->reserved_tid == tid) { 4664 ret = 0; 4665 goto out; 4666 } 4667 4668 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4669 sdata_err(sdata, "TID reservation already active\n"); 4670 ret = -EALREADY; 4671 goto out; 4672 } 4673 4674 ieee80211_stop_vif_queues(sdata->local, sdata, 4675 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4676 4677 synchronize_net(); 4678 4679 /* Tear down BA sessions so we stop aggregating on this TID */ 4680 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4681 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4682 __ieee80211_stop_tx_ba_session(sta, tid, 4683 AGG_STOP_LOCAL_REQUEST); 4684 } 4685 4686 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4687 __ieee80211_flush_queues(local, sdata, queues, false); 4688 4689 sta->reserved_tid = tid; 4690 4691 ieee80211_wake_vif_queues(local, sdata, 4692 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4693 4694 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4695 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4696 4697 ret = 0; 4698 out: 4699 return ret; 4700 } 4701 EXPORT_SYMBOL(ieee80211_reserve_tid); 4702 4703 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4704 { 4705 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4706 struct ieee80211_sub_if_data *sdata = sta->sdata; 4707 4708 lockdep_assert_held(&sdata->local->sta_mtx); 4709 4710 /* only some cases are supported right now */ 4711 switch (sdata->vif.type) { 4712 case NL80211_IFTYPE_STATION: 4713 case NL80211_IFTYPE_AP: 4714 case NL80211_IFTYPE_AP_VLAN: 4715 break; 4716 default: 4717 WARN_ON(1); 4718 return; 4719 } 4720 4721 if (tid != sta->reserved_tid) { 4722 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4723 return; 4724 } 4725 4726 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4727 } 4728 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4729 4730 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4731 struct sk_buff *skb, int tid, 4732 enum nl80211_band band) 4733 { 4734 int ac = ieee80211_ac_from_tid(tid); 4735 4736 skb_reset_mac_header(skb); 4737 skb_set_queue_mapping(skb, ac); 4738 skb->priority = tid; 4739 4740 skb->dev = sdata->dev; 4741 4742 /* 4743 * The other path calling ieee80211_xmit is from the tasklet, 4744 * and while we can handle concurrent transmissions locking 4745 * requirements are that we do not come into tx with bhs on. 4746 */ 4747 local_bh_disable(); 4748 IEEE80211_SKB_CB(skb)->band = band; 4749 ieee80211_xmit(sdata, NULL, skb); 4750 local_bh_enable(); 4751 } 4752